How does loneliness affect your brain?

Spreng et al. The default network of the human brain is associated with perceived social isolation. Nature Communications. December 2020.

A recent study found fundamental structural and functional differences in the brains of lonely people. Researchers examined the magnetic resonance imaging (MRI) data, genetics, and psychological self-assessments of over 40,000 middle-aged and older adults in the UK Biobank medical database. They then compared the MRI data of participants who reported often feeling lonely with those who did not. There were several major differences in the brains of lonely people which were primarily found in what is called the “default brain network,” a group of brain regions that are involved in inner thoughts such as remembering, future planning, imagining, and thinking about others. Detailed analyses of these regions showed that surprisingly, the default networks of lonely people were more strongly wired together and their grey matter volume in regions of the default network was greater. Moreover, bundles of nerve fibers called fornix that connects the hippocampus to the default network were better preserved in the brains of lonely people. These findings suggest that since lonely people are more likely to use imagination, memories of the past, or envisioning the future to overcome their social isolation they strengthen memory-based functions of their default networks through internally-directed thoughts and imagining social experiences. Loneliness has been increasingly turned into a major health problem, as other studies showed that older people who experience loneliness have a higher risk of cognitive decline and dementia. As COVID-19 related social distancing continues, isolation and loneliness could affect our society even more dramatically. Understanding how loneliness manifests itself in the brain at the structural and functional level, and how these paradoxical findings translate into late-onset brain pathologies, would be critical to prevent both neurological diseases and related social problems.

Human-made mass is about to exceed total global living biomass

Elhacham et al. Global human-made mass exceeds all living biomass. Nature. December 2020.

Humanity is rapidly approaching a new milestone in the history of our planet. The amount of manmade objects on Earth will soon outweigh all living biomass. A new study finds that each person alive today produces approximately the amount of manmade mass equivalent to their bodyweight every week. Our daily life objects such as roads, houses, cars, and clothes now weigh in at around 1.1 trillion metric tons, which is equal to the combined dry weight of all plants, animals and microorganisms on the planet. The production and accumulation of manmade objects, also known as anthropogenic mass, has accelerated since the early 1900s. The world’s plastics alone now weigh twice as much as the planet’s marine and terrestrial animals.

About 50% of the current anthropogenic mass is concrete. Bricks, asphalt, metals, plastic, and other materials make up about 19% of the total. Three major problems will arise from the outproduction of antropogenic mass. First, manufacturing consumes resources which will not be available for future generations unless objects are recycled or new raw materials are discovered. Second, even if we can achieve 100% recycling, pollution is generated and energy is used during manufacturing, so resources are still consumed. Third, many of the manufactured items will eventually be discarded which will cause serious disposal issues in the future. This is particularly alarming for the future. Nature is not infinite like so many of us would like to believe. If the current trend continues, anthropogenic mass will grow to three times the world’s biomass by 2040. In the next 20 years, we will generate as much waste as from the last 110 years together. These huge waste flows could lead to massive environmental catastrophes. This study demonstrates the brutal scale and impact of human activities on our planet. Humans are modifying the planet to such an extent that we might have already started a new geologic epoch likely called the Anthropocene.

Drug repurposing by artificial intelligence

Liu et al. A deep learning framework for drug repurposing via emulating clinical trials on real-world patient data, Nature Machine Intelligence. January 2021.

Researchers have developed a machine-learning method that analyzes very large datasets to discover which existing medications could work for diseases for which they were not prescribed. This process is called “drug repurposing,” a popular strategy to find new purposes for existing drugs that offers a rapid transition from research to clinical care. Drug repurposing can lower the risk associated with safety testing of new medications and dramatically reduce the time and money required to get a drug into the marketplace for clinical use. However, discovering new uses for existing medications still requires time-consuming and expensive randomized controlled trials to prove that a drug that is effective for one disorder will also be useful to treat another disorder. To overcome this challenge, a team designed a computational framework that works in two steps. First, it searches enormous patient care-related datasets with high-powered computation to arrive at repurposed drug candidates for a given disease. Second, it calculates and estimates effects of those existing medications on a defined set of clinical outcomes. As a proof-of-principle, researchers decided to focus on repurposing of drugs to prevent heart failure and strokes in patients with coronary artery disease. The edge of the machine learning approach is that it can analyze and compare thousands of human differences within a large population that could influence how a drug will work in the body. These confounding factors such as age, gender, race, and disease severity function as parameters in the deep learning computer algorithm on which the framework is based. This information is streamed from “real-world evidence,” which consists of longitudinal observational data about millions of patients captured by various sorts of electronic medical records. The team used insurance data for more than 1.2 million heart-disease patients. The algorithm analyzed each patient’s drug prescriptions and diagnostic tests for every visit and models input for drugs based on their active ingredients. The model yielded a total of 9 drugs with potential therapeutic benefits, three of which are currently in use and six new candidates for drug repurposing. Interestingly, two diabetes medications, metformin and escitalopram, have been found to lower the risk of heart failure and stroke in the model patient population. This study shows how artificial intelligence can speed up hypothesis generation and clinical trial processes. While this study focused on heart failure and stroke, the framework is flexible and could be applied to most complex diseases.

Nooriye is a 39-year-old Iraqi female. She had a pretty normal life until a group of terrorists knocked on her door. Her two sons were killed in front of her. She was abused and tortured for days, as was her husband. Rebels eventually took her husband and left. Some neighbors helped her to bury her sons and provided her with shelter and food. She was about to kill herself when, miraculously, her husband came back 57 days later. He never told her what he went through during those 57 days. They were both in extreme pain but able to hold onto each other.

They immigrated to the U.S. a year later. Her husband found a job and is still working. They are safe now, but it has not been enough to heal them. Both still have nightmares and flashbacks. She spends all her time in her home. She stares at walls, feels numb and very fearful, and cries every day. Her speech is sparse, and she never smiles. She goes out with husband once a day but grabs his hand and won’t let him go when they are out. When faced with stress, she often passes out.

Her husband “has to be strong because she is the only thing he has,” although he also has extreme pain. He hides his tears from his wife, is unable to sleep at night, feels guilty, and misses his sons. He is afraid to make any Iraqi friends and stays away from mosques.

Obviously, providing a safe place, food, and a job is not enough to heal these people’s pain. Invisible wounds and problems are much harder to treat than visible ones.

In this article we will try to elucidate some elements of what Nooriye and thousands of other families have been exposed to all around the world.

Mass trauma

When a group of people, regardless of size, experience psychological effects after a trauma that was suffered collectively, this is called a mass trauma. Sometimes an entire society witnesses the same trauma, and this may cause a collective sentiment, often resulting in a shift in that society’s culture and mass actions.^1,2

Wars, political violence, natural disasters, exile, torture, and terrorism are examples of mass trauma. The Holocaust, the Atomic bombing of Hiroshima and Nagasaki, slavery in the United States, and the 9/11 attacks are well-known collective traumas.

Collective traumas have been shown to play a key role in group identity formation. Having the same problems, suffering from the same pain, and being under the same pressures bring individuals together. This togetherness eventually helps to build a community, a group, and sometimes a nation. Almost every nation has traumatic events in their history. Even the concept of “nation” is extensively affected by these events.

Nevertheless, despite its role in building group identity, mass trauma is still individually painful. In fact, the effects of mass trauma can be very deep and transferred through the generations. In 1966, clinicians observed that large numbers of children of Holocaust survivors were seeking treatment in psychiatric clinics in Canada. Moreover, when compared to the general population, the grandchildren of Holocaust survivors were three times more likely to seek clinical psychiatric help.³

Post-Traumatic Stress Disorder

According to the National Center for Posttraumatic Stress Disorder, the most common stress reactions in the wake of disaster may include the following:

Emotional reactions, including shock, fear, grief, anger, guilt, shame, feeling helpless, feeling numb, and sadness.

Cognitive reactions, including confusion, indecisiveness, worrying, shortened attention span, and trouble concentrating.

Physical reactions, including tension, fatigue, edginess, insomnia, bodily aches and pains, startling easily, racing heartbeat, nausea, change in appetite, and changes in other bodily desires.

Interpersonal reactions, including distrust, conflict, withdrawal, work or school problems, irritability, loss of intimacy, and feeling rejected or abandoned.⁴

Several factors present in the acute-phase recovery environment of a disaster have been found to aggravate stress reactions and therefore increase survivors’ risk of developing negative outcomes. These include:

• Lack of emotional and social support
• Presence of other stressors such as fatigue, cold, hunger, fear, uncertainty, loss, dislocation, and other psychologically stressful experiences
• Difficulties at the scene
• Lack of information about the nature and reasons for the event
• Lack of, or interference with, self-determination and self-management
• Treatment [given] in an authoritarian or impersonal manner
• Lack of follow-up support in the weeks following the exposure

Protective factors that may mitigate negative effects include:

• Social support
• Higher income and education
• Successful mastery of past disasters and traumatic events
• Limitation or reduction of exposure to any of the aggravating factors listed above
• Provision of information about expectations and availability of recovery services
• Care, concern and understanding on the part of the recovery services personnel
• Provision of regular and appropriate information concerning the emergency and reasons for action.⁵

In most cases, the symptoms of trauma eventually disappear, but unfortunately, some of the survivors of the mass trauma will eventually develop Post-Traumatic Stress Disorder (PTSD). PTSD is a mental disorder resulting from exposure to an extreme traumatic stressor.

The National Comorbidity Survey Replication (NCS-R), conducted between February 2001 and April 2003 in the U.S., estimated the lifetime prevalence of PTSD among adult Americans to be 6.8%.⁶ The lifetime prevalence of PTSD among men was found to be 3.6% and among women 9.7%. ⁷

PTSD is described in the Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition) (DSM 5) which is published by the American Psychiatric Association, as:

Criterion A (at least one required): The person was exposed to: death, threatened death, actual or threatened serious injury, or actual or threatened sexual violence, in the following way(s):

• Direct exposure
• Witnessing the trauma
• Learning that a relative or close friend was exposed to a trauma
• Indirect exposure to aversive details of the trauma, usually in the course of professional duties (e.g., first responders, medics)

Criterion B (at least one required): The traumatic event is persistently re-experienced, in the following way(s):

• Intrusive thoughts
• Nightmares
• Flashbacks
• Emotional distress after exposure to traumatic reminders
• Physical reactivity after exposure to traumatic reminders

Criterion C (at least one required): Avoidance of trauma-related stimuli after the trauma, in the following way(s):

• Trauma-related thoughts or feelings
• Trauma-related reminders

Criterion D (at least two required): Negative thoughts or feelings that began or worsened after the trauma, in the following way(s):

• Inability to recall key features of the trauma
• Overly negative thoughts and assumptions about oneself or the world
• Exaggerated blame of self or others for causing the trauma
• Negative affect
• Decreased interest in activities
• Feeling isolated
• Difficulty experiencing positive affect

Criterion E (two required): Trauma-related arousal and reactivity that began or worsened after the trauma, in the following way(s):

• Irritability or aggression
• Risky or destructive behavior
• Hypervigilance
• Heightened startle reaction
• Difficulty concentrating
• Difficulty sleeping

Criterion F (required): Symptoms last for more than 1 month.

Criterion G (required): Symptoms create distress or functional impairment (e.g., social, occupational).

Criterion H (required): Symptoms are not due to medication, substance use, or other illness.⁸

Treatment for mass trauma:

Treatment for mass trauma should be delivered at two different levels: the community level and the individual level.

1. Community level:

Dr. Frantz Omar Fanon gives the recipe for mass trauma treatment at the community level: “Mass trauma can be alleviated through cohesive and collective efforts such as recognition, remembrance, solidarity, communal therapy and massive cooperation.”

The statement above can be a topic for a separate article. Here, we would like to express the importance of the remembrance days. People comes together on remembrance days and remind the victims that they are not alone and not forgotten. This can be therapeutic for the victims and alleviate their pain.

2. Individual level

PTSD treatment includes pharmacotherapy (medical treatment) and psychotherapy. Some of the medications which have been helpful combatting depression are selective serotonin reuptake inhibitors (SSRIs), such as Fluoxetine (Prozac), Sertraline (Zoloft), Paroxetine (Paxil), and serotonin-norepinephrine reuptake inhibitors (SNRIs) such as Venlafaxine (Effexor) and Duloxetine (Cymbalta).

There are several therapy types that have been shown to be effective at treating PTSD. Trauma-focused psychotherapies are the most highly recommended psychotherapies for PTSD. In these therapy types the treatment focuses on the memory of the traumatic event or its meaning. These treatments use different techniques to help a victim process their traumatic experience. Some involve visualizing, talking, or thinking about the traumatic memory. Others focus on changing unhelpful beliefs about the trauma. Prolonged exposure therapy, Cognitive Processing Therapy, Eye-Movement Desensitization and Reprocessing, Brief Eclectic Psychotherapy, and Narrative Exposure Therapy are the some of the therapies that have been found to be helpful for PTSD patients.

Additionally, spirituality might help treat PTSD, too. A study of Bosnia-Herzegovina war veterans suggested that veterans who prayed had significantly higher levels of incorporation, self-protection, and reactive formation and significantly lower levels of regression, compensation, transferring, lack of control, and aggressiveness than their peers who did not pray. ⁹

In brief, providing shelter, food, and a safe environment are mandatory for trauma patients, but they aren’t nearly enough. Psychological traumas are very hard to treat, and treatment may take years. It has been shown that soldiers who have somebody to share their war experience/trauma with, have a lower risk for PTSD when compared with the ones who can’t talk to anybody. Victims need professional help along with community support. Trauma can be alleviated through cohesive and collective efforts and cooperation. Praying for the trauma victims, as politicians suggested for recent hurricane victims, definitely has some social impact. It has also been shown that medication/prayers decrease PTSD symptoms ¹⁰; however, showing support and empathy, listening to victims, and acts of remembrance are the other key elements of community support.

References

1. Lisa Gale Garrigues, “Slave and Slave Holders Break Free of History’s Trauma“, Yes Magazine, August 2, 2013
2. Updegraff, Silvler, Holman, “Searching for and Finding Meaning in Collective Trauma, Journal of Personal and Social Psychology, September 2008
3. Coffey, R. (1998). Unspeakable truths and happy endings. Sidran Press. ISBN1-886968-05-5
4. https://www.ptsd.va.gov/professional/pages/handouts-pdf/Reactions.pdf
5. NSW Institute of Psychiatry and Centre for Mental Health. (2000). Disaster Mental Health Response Handbook.North Sydney: NSW Health.
6. Kessler, R.C., Berglund, P., Delmer, O., Jin, R., Merikangas, K.R., & Walters, E.E. (2005). Lifetime prevalence and age-of-onset distributions of DSM-IV disorders in the National Comorbidity Survey Replication. Archives of General Psychiatry, 62(6): 593-602.
7. National Comorbidity Survey. (2005). NCS-R appendix tables: Table 1. Lifetime prevalence of DSM-IV/WMH-CIDI disorders by sex and cohort. Table 2. Twelve-month prevalence of DSM-IV/WMH-CIDI disorders by sex and cohort. Accessed at: http://www.hcp.med.harvard.edu/ncs/publications.php
8. American Psychiatric Association. (2013) Diagnostic and statistical manual of mental disorders, (5th ed.). Washington, DC.
9. Pajević I, Sinanović O, Hasanović M. Association of Islamic Prayer with Psychological Stability in Bosnian War Veterans. J Relig Health. 2017 Dec;56(6):2317-2329. doi: 10.1007/s10943-017-0431-z.
10. Gallegos AM, Crean HF, Pigeon WR, Heffner KL. Meditationand yoga for posttraumatic stress disorder: A meta-analytic review of randomized controlled trials. Clin Psychol Rev. 2017 Dec; 58:115-124. doi: 10.1016/j.cpr.2017.10.004.

Biggest extinction in Earth’s history caused by global warming—and how it could happen again

Penn JL et al. Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction. Science, December 2018.

Some 252 million years ago, long before dinosaurs, the vast majority of species on Earth were wiped out in the “Great Dying,” the worst mass extinction in our planet’s history. Up to 96% of all marine species and 70% of land animals were killed off during this event. Scientists have been trying to find the cause for this catastrophic event, which marked the end of the Permian period. One study suggested that a type of microbe spouted large amounts of methane into the atmosphere. Other studies suggested the event was triggered by a series of volcanic eruptions that released deadly amount of carbon dioxide into the air and led to cataclysmic ocean acidification. A new research study now claims that the Great Dying was primarily as a result of rapidly increasing temperatures. The researchers examined the marine fossil records and simulated the climate conditions to observe the effects of rising temperatures 252 million years ago. Researchers first ran a climate model with Earth’s configuration during the Permian period, when the tropical ocean temperatures at the surface had reached some 10 degrees Celsius (50 degrees Fahrenheit) higher. The model then reproduced dramatic changes in the oceans; oceans lost about 80 percent of their oxygen and about half the oceans’ seafloor became completely oxygen-free. To investigate the effects of these paleoclimate changes on marine species, the researchers then analyzed the varying oxygen and temperature sensitivities of 61 modern marine species including crustaceans, fish, shellfish, corals and sharks. Their calculations predicted that many marine organisms went extinct under these conditions, especially the organisms that lived far from the tropics were most sensitive to oxygen levels and they were nearly completely wiped out. To test this prediction, researchers analyzed late-Permian fossil distributions from the Paleoceanography Database and confirmed that species far from the equator suffered most during the event. The agreement between the simulations and fossils strongly suggests that climate warming and oxygen loss was a primary cause of the extinction. By 2100, warming in the upper ocean is projected to approach 20 percent of warming in the late Permian, and by the year 2300 it will reach between 35 and 50 percent. This study highlights the potential for a mass extinction arising from a similar mechanism under anthropogenic climate change. It is also a clear warning that Earth is on the path to another devastating mass extinction. According to experts, Earth could already be undergoing a sixth mass extinction that would kill off most animal and plant species. The International Union for the Conservation of Nature predicts that 99.9% of critically endangered species and 67% of endangered species will be lost within the next 100 years.

New target for therapeutic brain stimulation to treat depression found

Rao VR et al. Direct Electrical Stimulation of Lateral Orbitofrontal Cortex Acutely Improves Mood in Individuals with Symptoms of Depression. Current Biology, November 2018.

Researchers have finally found an effective target in the brain for electrical stimulation to improve mood in people suffering from depression. Stimulation of a brain region called the lateral orbitofrontal cortex (OFC) reliably produced acute improvement in mood in patients who suffered from depression. In a recent study, researchers studied 25 patients with epilepsy who had electrodes placed in the brain for medical reasons to locate the origin of their seizures. Many of those patients also suffered from depression, which is often comorbid with epilepsy. With the patients’ consent, researchers took advantage of those electrodes to deliver small electrical pulses to areas of the brain thought to be involved in regulating mood. The researchers focused their attention and the electrical stimulation on the OFC, which is a key hub for mood-related circuitry. Moreover, they specifically induced a pattern of activity in brain regions connected to OFC that was similar to patterns seen when patients naturally experienced positive mood states. The researchers applied these stimulation regimes while collecting verbal mood reports and questionnaire scores. Analyses of these reports revealed that unilateral stimulation of the lateral OFC produced acute, dose-dependent mood-state improvement in subjects with moderate-to-severe baseline depression. There is still substantial work remains to be completed before the deep brain stimulation (DBS) treatments could enter routine clinical practice. One major challenge in this study is to see whether stimulation of OFC produces durable improvement in mood over longer periods of time. Biomedical engineers hope to develop a medical device for patients with treatment-resistant mood disorders that can monitor brain activity in OFC and stimulate only when needed to keep that activity within a healthy range. Ultimately, it would be ideal if activity in mood-related brain circuits could be normalized indefinitely without patients needing to do anything.

How screen time can disrupt sleep

Mure LS et al. Sustained Melanopsin Photoresponse Is Supported by Specific Roles of β-Arrestin 1 and 2 in Deactivation and Regeneration of Photopigment. Cell Reports, 2018

For most of us, the time spent staring at screens on computers, phones and tablets adds up to many hours in a day and can often disrupt sleep. In a recent work, researchers now have pinpointed how certain cells in the eye process ambient light and reset our internal clocks, the daily cycles of physiological processes known as the circadian rhythm. When these cells are exposed to artificial light late into the night, our internal clocks can get confused, resulting in a host of health issues. A protein called melanopsin in these light-sensitive cells helps them process ambient light. Prolonged exposure to light causes melanopsin to regenerate and continuous regeneration of melanopsin triggers signals to the brain that inform it about ambient light conditions. The brain then uses this information to regulate sleep, alertness, and consciousness. In this study, the researchers turned on the production of melanopsin in retinal cells in mice and found that some of these cells are able to sustain light responses, but others lose sensitivity. Further investigations found that proteins called beta arrestin-1 and beta arrestin-2 help keep the melanopsin sensitive when exposed to light. One arrestin does its conventional job of arresting the response, and the other helps the melanopsin protein reload its retinal light-sensing co-factor. When these two steps are done in quick succession, the cell appears to respond continuously to light. This research uncovers the mechanisms behind how cells being exposed to artificial light confuses the internal body clock, and the ability to regulate sleep. It is hoped that this discovery could lead to new targets that could counter the impact of artificial light, for example by finding ways to influence melanopsin to reset the internal clock. This could lead to new treatments for insomnia, jet lag, and migraines.

However, none of these movies properly – or accurately – explains radiation. Regardless of what you do and where you are on a typical day, you are being exposed to millions of particle showers – another term for radiation – at all times. Radiation is all around us, but we are not turning into monsters, giants, or any other kind of creature. We do not even sense most of the radiation unless the harmful effects reach the detectable level. In fact, radioactive isotopes (the sources of radiation) found in water, air, soil, and most places in the environment have been emitting radiation since the Big Bang ^[1], which occurred approximately 14 billion years ago.

Radiation can be emitted by both natural and man-made sources ^{[2, 3]}. There are generally two main types of natural radiation: radiation from natural sources, such as elements in the ground, is terrestrial, and radiation from outer space, such as charged particles and gamma rays, is cosmic. For example, at this very moment you are being bombarded with cosmic rays every few seconds. On the other hand, the main human-made source of radiation exposure is from medical sources like nuclear medicine, x-rays, computed tomography (CT) scans, etc.

There are various types of radiation emitted by the sun. The most widely recognized forms are visible light, infrared, ultraviolet (UV), x-ray, and gamma radiation. We can only see the visible light, which is defined as having a wavelength on the electromagnetic spectrum between 400-700 nm (a nanometer, or nm, is approximately 10-9 meter). Some of the other kinds of light have greater wavelengths, and some have smaller. In short, visible light’s region is a very narrow part of the wide EM spectrum.

Why can our eyes see only within this limited range? There are several reasons ^[4]: solar emissions, low absorption in the atmosphere, the energy of chemical bonds, the optical properties of matter, black-body emissions, and so on. Unless all these reasons align into a specific rhythm, we cannot see the kind of light. There are many laws determining light, and the fact that we can see even some light is quite remarkable, and a sign of how perfectly calibrated the universe is.

Misfits of the standard model: Neutrinos

Following our discussion of radiation, I would like to focus on one particular type of radiation: neutrinos. Neutrinos are created in certain types of radioactive decay and nuclear reactions, such as those occurring in the sun. They are one of the most abundant particles in the universe; billions of them pass harmlessly through your body, unnoticed. David Griffiths, a physicist at Reed College, describes neutrinos in his book on particle physics ^[5]:

“…neutrinos interact extraordinarily weakly with matter; a neutrino of moderate energy could easily penetrate a thousand light years of lead. That’s a comforting realization when you learn that hundreds of billions of neutrinos per second pass through every square inch of your body, night and day, coming from the sun.”

In total, there are three kinds of neutrino flavors, as they are called. These are electron neutrinos, muon neutrinos, and tau neutrinos. Each kind has a tiny mass. According to the Standard Model, there are three kinds of particles in the universe: “light-weight” leptons, “mid-weight” mesons, and “heavy-weight” baryons, such as protons and neutrons. Neutrinos are in the lepton family, which, in total, has only six particles; they have weak interactions within the universe. Neutrinos are neutral leptons since they are chargeless. Other leptons, electron, muon, and tau are called as charged leptons.

The Standard Model is one of the fundamental models in experimental high-energy physics explaining how the universe came into being. Well-known scientists are still improving the model to categorize particles properly in the universe with the aim of finding missing particles. The model explains very well the fundamental forces governing the world: strong nuclear forces, weak nuclear forces, gravitational force, and electroweak force. There were, frankly, two contradictions challenging the Standard Model until today: the Higgs mechanism ^[6] and the mass of neutrinos. The model predicted that Higgs boson ^[6] is the particle responsible for all the mass in the universe. CERN, the biggest particle accelerator^[7] on earth, announced in July 2012 that they had found a particle that behaves like the Standard Model predicted Higgs boson would. Scientists at CERN are still striving to understand the identity and features of this discovered particle. If they achieve that, they can unravel the mystery and origins of the universe a little bit more. At the end, only the mass of neutrinos will remain a controversial topic within the model.

The Standard Model predicted that neutrinos were chargeless and massless particles. However, cosmic, reactor, and accelerator neutrino experiments, which are the main three experiment types to track neutrinos, confirmed each other on the subject of neutrino oscillation. Neutrino oscillation, in short, means that they can change their flavors. For example, a tau neutrino can convert to an electron neutrino, and vice versa. This discovery shows that these particles can be chargeless but not massless. Each of them has to have small, different masses to be able to perform flavor conversions, according to the laws of physics. That is why these particles are usually called the misfits^[8] of the Standard Model.

Since each particle was produced with its antiparticle, according to Dirac’s theory of pairs^[9], neutrinos also have their antiparticles, so there are actually six types of neutrinos in the universe. Each antiparticle has exactly the same properties as the original particle, just with the opposite charge. What about the chargeless neutrinos? The difference between neutrinos and antineutrinos is their spin behavior, not their charge. They both have zero charge; however, antineutrinos have a right-handed spin and neutrinos have a left-handed spin.

If each particle has its own antiparticle in theory, there should be the same amount of particles and antiparticles in the universe. However, experimental results show that there are more particles than antiparticles. There are a lot of scientists explaining this dilemma by accepting a parallel universe in which there are more antiparticles than particles, so the total would still be the same. In return, some others are trying to clarify this contradiction by accepting that more particles were created at the beginning of the universe, approximately 14 billion years ago.

Acknowledgment: This article is produced at Mergeous ^[10], an online article and project development service for authors and publishers dedicated to the advancement of technologies in the merging realms of science and religion.

References

[1] Kaya, A. 2009. “The Expansion of the Universe and the Big Bang: A Qur’anic Perspective,” The Fountain Magazine, Issue 68.
[2] http://en.wikipedia.org/wiki/Radiation
[3] http://www.chem.duke.edu/jds/cruise_chem/nuclear/exposure.html
[4] Why can we see visible light? 2007. Physics Education, 42(1), pp. 37-40.
[5] David Griffiths, Introduction to Elementary Particles.
[6] Kara, Cihan. 2013. “Will CERN Reveal the Origin of the Universe or Cause the End,” The Fountain Magazine, Issue 92.
[7] http://home.web.cern.ch/
[8] Symmetry Magazine, A Joint Fermilab/SLAC Publication, Spring 2013.
[9] Mahmood B. S. 2009. “The Holy Qur’an and Dirac’s Theory of Pairs,” The Fountain Magazine, Issue 68.
[10] Mergeous, Online article and project development platform, http://www.mergeous.com

Can an apple move the earth? Physics says it can. The power that gave an apple the ability to move the world, also gave us humans the capacity to make use of the natural laws and be a true vicegerent on the earth.

In a universal arrangement of objects, from the smallest to the largest, in terms of length, time, and mass, where is the human located? In between the diameter of an atomic nucleus (10-14 meters) and the distance of the farthest galaxy from the earth (1026 meters), the human being occupies a zone between one and three meters. The human lifetime can be measured to be around 109 seconds in temporal length, to the duration of a ray of light passing through a proton (10-24 seconds), to the age of the universe (1017 seconds). And the human mass is located around a 102 kg zone, on a scale from the mass of an electron (10-31 kg), to the mass of the Milky Way galaxy (1041 kg).

Based on this data, understanding the human that is trapped in this enormous universe is crucial. Humans are just a speck, jammed between mote and sphere, living in a frail state of weakness and poverty. “Do not strut about the earth in haughty self-conceit; for you can never split the earth (no matter how hard you stamp your foot), nor can you stretch to the mountains in height (no matter how strenuously you seek to impress)” (Qur’an 17:37).

Humans, who need a vast amount of grace and support, are in search of answers to improve themselves. “Who am I?” they often ask; “where am I?” As scientists and researchers discover the excellence of the universe’s artistry, we begin to comprehend just how blessed humans are. Within the laws of science lie the answers to our questions. Laws are relative principles that operate according to the constants wisely built into the universe. These laws are veils to the majesty of creation. Each law is created anew every moment, thus we perceive them as if they are eternal patterns. For example, the human body gravitates to the center of the earth with a force equivalent to their mass multiplied by the average gravitational velocity of the earth, which is 9.8 m/s2. The law of gravity is created every moment in such fine measures that it is possible for us to walk on the ground.

It helps to remember Newton’s three laws in physics. The first is the principle of inertia, which states that unless there is an external force, or if the sum of all forces cancel each other out in direction and size, then an object is either at rest or moves at a constant velocity. The second law is that force equals the mass of an object multiplied with its acceleration. And the third is the action-reaction principle, which states that when a force is applied to an object, the object exerts a force in opposite direction, equal in magnitude. This means that when an apple is thrown into the air, and the apple accelerates in opposition to gravity, the earth is distanced from the apple with the same amount of force. Similarly, when the apple falls down because of gravity, the apple is also pulling the earth with the same magnitude. If this was to repeat constantly, theoretically a movement like the one made by a yo-yo should have happened between the apple and the earth. Because of its huge mass, the earth’s acceleration is very small, thus this yo-yo movement would not be felt. An object as small as an apple actually moves an object the size of the planet. This means that the power that gave an apple the ability to move the world, also gave us humans the capacity to make use of the natural laws and be a true vicegerent on the earth.

Nothing in the universe has been created in vain – all phenomena occur because of a purpose they are assigned to fulfill. In a universe in which everything is bound by a complicated web of laws that are created without a moment’s lapse, humankind surely has a significant role to play in the unique position with which they are graced. This position undoubtedly requires a sense of humility in the face of all the grandeur around us, yet also being aware of our given capacities, which enable us to master over all existence.

CERN, the most advanced physics laboratory on earth, announced on July 2012 that they had found a particle that behaved like the Higgs boson, a particle predicted almost 50 years ago to exist. This discovery has brought with it the possibility that the Higgs boson may be responsible for all the mass in the universe and that if it does really exist scientists can unravel the mystery and origins of the universe a little more.

Until the 18th century there was no precise distinction between philosophers and scientists. Philosophy and science merged when the ancient philosophers shaped science and improved scientific methods as we know today. Confucius, Plato, Aristotle, Avicenna (Ibn-i Sina) and Descartes are a few of the greatest known philosophers in history. Most of the prospering scientists in different disciplines have been inspired by their works. For instance, Johannes Kepler, Galileo Galilee, Isaac Newton, James Clerk Maxwell and Albert Einstein, all highly regarded physicists, were heavily influenced by the works of ancient philosophers. All of the aforementioned physicists tried to understand the physical laws that governed energy, time, and space. Even now, modern physicists are still trying to answer some of the most important questions: What is the nature of the universe and what is it made of? Are there undiscovered physical laws of nature? Are there extra dimensions of space? How can we solve the mystery of dark energy?

Today, in order to understand the composition of matter and how the universe was created, the most prominent particle and high energy physicists are designing huge particle accelerators and detectors. Particle accelerators, also known as atom smashers, are devices that use electromagnetic fields to propel a group of charged particles (ions) to high speeds and collides them with other moving particles or a stationary target composed of a bunch of particles (http://public.web.cern.ch). Particle detectors (radiation detectors) are used to detect, track, visualize and identify particles produced from reactions in accelerators. Scientists analyze the results of the collisions and try to understand interactions between the basic constituents of matter. This is the basis of understanding the components of the universe. The largest and most complex of these scientific instruments is located at CERN, the most advanced physics laboratory on earth. Egin Lillestol, a particle physicist from the University of Bergen (Norway), says that [1] there is nothing quite like CERN anywhere else on earth.

What does CERN stand for? CERN is the French acronym of Conseil Européen pour la Recherche Nucléaire which means European Council for Nuclear Research. It was founded in 1954. It attracts physicists and engineers from all over the world. According to CERN’s sources, half of the world’s particle physicists, about ten thousand scientists, are either doing active research or visiting there. They all work together toward their common goals of advancing technology, answering questions for better understanding the material world and training future scientists. CERN has also seen the development of many practical scientific applications other than those involved with high energy and particle physics. For instance, the world-wide-web was invented at CERN to allow international scientists to communicate and share their ideas more easily. From 1954 to present, scientists at CERN have received Nobel Prizes in Physics including Sam Ting, Burt Richter, Jack Steinberg and Georges Charpak.

CERN hosts the largest and highest energy particle accelerator, the Large Hadron Collider (LHC), which is twenty-seven kilometers in circumference and about one hundred meters under the ground. The LHC enables scientists to collide two groups of particles such as protons and lead ions. Physicists analyze and study the particles that are created in the collisions to study conditions just after the Big Bang, the phenomenon that is believed to form the universe 13.7 billion years ago. Many people in the world are looking forward to see the results the LHC will be producing.

CERN: Black holes

Some people have expressed concerns about the safety of the collider at CERN. The biggest concern is whether or not an atom-smasher as big as the LHC could create black holes and destroy the earth. In 2003, LHC Safety Assessment Group (LSAG) reported that the possible production of vacuum bubbles, magnetic monopoles and magnetic black holes at the LHC have no real risk. However, concerns about the safety of creating micro black holes in such a high energy particle accelerator have surfaced in the media for many years. Some media sites claimed that a black hole would be formed and destroy everything. Others announced that the LHC might cause earthquakes. According to the administrator of lhcfacts.org, a website in which scientists discuss the lack of safety at the LHC, the possibility of creating a micro black hole at CERN cannot be ignored, and there are two predictions about what that micro hole would be: according to the more optimistic outcome, the micro black hole evaporates before becoming a threat. According to the second prediction, however, the hole could grow quickly and endanger Earth. Eventually, the LSAG finished the discussion by reaffirming and publishing a second review which reports:

“The possibility of creating micro black holes at the LHC is at the rate of the order of one per second. These are harmless because they would quickly decay by hawking radiation (thermal radiation) according to standard calculations. They decay before even reaching the detector.”

Moreover, these kind of events, even with higher energies than those created in any man-made atom smasher, occur naturally and routinely in the universe. For example, ultra high energy cosmic rays (particles created in outer-space) come into contact with Earth’s atmosphere without any hazardous consequences. In brief, American physicist Karen D. Camarda said “If anything bad was going to happen, nature would have already done it.”

CERN: Higgs Boson

Another case which has dominated world news headlines mid-2012 was the Higgs boson, otherwise known as the “God particle.” What exactly is the Higgs boson and why is it called the God particle? The Higgs boson is a yet undiscovered particle which is taught to be a mechanism for how subatomic particles acquire mass. Most likely, it has a mass between the regions 115-130 GeV of energy. The Higgs mechanism was postulated by British physicist Peter Higgs in 1960s. The theory hypothesizes that the Higgs field, a kind of three dimensional frameworks, fills the universe. A particle borrows mass from the Higgs field when it moves through it. This is similar to the process that an electron undergoes as it gains mass when it passes through a positively charged crystal lattice of atoms. The “God particle” was coined as a nickname of the Higgs boson after Nobel prize winning physicist Leon Lederman published his popular science book in 1993 with the title of The God Particle: If the Universe Is the Answer, What Is the Question? Lederman said he gave the particle this nickname because it is “so central to the state of physics today, so crucial to our understanding of the structure of matter” [2]. To explain further, the term “God particle” is more applicable to marketing than to science and theology. According to many scientists, calling it the “God particle” is inappropriate because it does not have any connection with God or any religion. Many wonder what will happen if scientists find the Higgs boson. Brad Hirschfield, President of the National Jewish Center for Learning and Leadership said in his article [3] in The Washington Post:

“While not exactly a theory of creation, finding the God Particle would bring us closer to an understanding of the fundamental processes that govern physical existence.”

Furthermore, some scientists admit that exploration in this field will be far from over even after the Higgs boson is found. Instead, the discovery will open doors to newer and more complex questions. For instance, Michio Kaku, the co-founder of String Theory, asserts [4] that finding the Higgs boson is not enough. He says that “we are at the beginning, not the end of physics. The adventure continues.” In spite of these sentiments, some people, including myself, believe that the discovery of the Higgs boson might reveal a very large missing piece in the physics puzzle.

Acknowledgment: This article is produced at Mergeous [5], an online article and project development service for authors and publishers dedicated to the advancement of technologies in the merging realms of science and religion.

Kara is a freelance pop-sci writer pursuing a PhD in Physics.

References

[1] CERN, “A Unique Experience,” http://user.web.cern.ch/

[2] Lederman, Leon M. 1993. The God Particle: If the Universe Is the Answer, What Is the Question?: A Tale of Two Particles and the Ultimate T-Shirt, Bantam Doubleday Publishing Group.

[3] Hirschfield, Brad. 2011. “The ‘God Particle’ and God,” The Washington Post.

[4] Kaku, Michio. 2011. “The ‘God Particle’ and the Origins of the Universe,” The Wall Street Journal.

[5] Mergeous, Online article and project development platform, http://www.mergeous.com

[11] DOE/NSF, High Energy Physics Advisory Panel, Quantum Universe, The Revolution in 23st Century Particle Physics, 2003.

By the time you finish reading this sentence, you will have been carried over the earth, passed the sun, and moved through actual space of 1000 kms! In the time it takes you to ponder upon this, you will have moved another 1000 km through real space. Fast isn’t it? This is the speed at which one arm of our galaxy moves through space every second, and we don’t even feel a thing!

The motion of stars in their dedicated orbits, black holes, nebulas, and infinite number of other phenomena in the outer space display spectacular and equally thoughtful exhibitions thanks to Hubble and other new technologies. An increasing number of studies are thus devoted to stars, supernovas and interstellar space in recent years. Our contemplation of the universe deepens as we accrue more knowledge about it. Just as a cell is the functional building unit of the body, the main building blocks of the universe are galaxies. Just like every other living thing, galaxies will not be around for eternity; they form, develop, and cease within the cosmic laws that are put in place by their Creator.

According latest findings, it is estimated that around 100 billion galaxies exist in the observable universe and that there are galaxies 100,000 light years in size. A year has 31,536,000 seconds. Light travels 300,000 kilometers per second, therefore one light year equals to 946,080,000,000,000,000 (quadrillion) kilometers. Apart from the dispersal of stars, intergalactic distances of galaxies are not much bigger than their own galactic size. For example, the big Andromeda galaxy (the galaxy which is the closest to us) appear from the earth as wide as the sun or moon in the sky and can even be noticed with the naked eye. Latest research in astrophysics revealed that stars are not dispersed equally but rather found together in galaxies as an open system that exchanges energy and matter with its surroundings. A big portion of the galactic space is filled with gas and dust clouds which enable such exchanges to take place. This interstellar stage in which stars are born and die bears vital importance in sustaining and maintaining a galactic presence.

Some amazing characteristics of galaxies

Stars with different masses exist in a galaxy. Smallest one can be one tenth of the Sun’s mass whereas the biggest can be 100 times bigger than the sun. The most important feature of a star in a galaxy is its mass. Brightness of stars increase with their mass and this relation is three dimensional (cubic mass). Therefore if a star is twice as big, it is eight times brighter. Another feature is the relation between the age and mass of a star. The bigger the star, the shorter its life. These big stars live shorter compared to smaller ones despite their giant fuel reserves because they consume it very fast. Similar relations can be observed in the human body, which is an index of the universe, such that overweight people who consume more calories than people with less calorie intake eventually consumes more energy and become subject to deterioration in health and faster aging. The lifespan of a star is inversely proportional with its square mass (1/m2). For example, if a star is twice as massive, it lives only for one fourth of the time. Calculations show that our sun has a lifespan of 10 billion years. Compared to this, if a star is 30 times bigger than sun, it will only live for 10 million years.

The timescale of events that are occurring in galaxies can vary from thousands of years up to millions of years. Time required for the creation of a star is perhaps like a day in a galactic scale. This long time frame is considered short when compared with the age of galaxies. Furthermore, verses in the Qur’an (Al-Ma’arij 70:4) open new horizons in this matter and point out to the fact that time can change depending on different ratios and scales; so a day can indeed vary in length from being 1000 years or 50,000 years.

The movement and behavior of galaxies are quite complicated. Such that even if the galaxy formation process is completed, the creation and expiration process of stars within the galaxy still continues. It takes tens of thousands of years for a gas cloud to collapse inwards under its own gravitational force and become a star under normal conditions. Even five-ten billion years after the creation of a galaxy, it amazes scientists that there is still plenty of gas to remain in the interstellar stage, enough for a star to be born. On the other hand there are galaxies in which star formation is much faster than our Milky Way galaxy. These galaxies are called “starburst” galaxies and new stars are created in variable speeds over a long period of time. The uniqueness that is observed in the specific characterization of animal and plant species can also be witnessed in the creation of stars at different speeds, making spiral galaxies even more mysterious. This is because while a steady and balanced speed in the creation of stars is maintained in spiral galaxies, all the gas and dust available is consumed for the formation of stars in other galaxies. In a galaxy where stars continue to be created, the regions where large stars are created can be observed better compared to other regions in the night sky.

Spiral galaxies

Galaxies are generally divided into three groups: irregular shaped, elliptical, and spiral. Irregular shaped galaxies are composed of many young stars, gas and dust clouds without a definite shape. Elliptical galaxies are made up of old stars and limited number of gas and dust clouds. They are created in different shapes such as round, flat or like a baseball. Spiral galaxies are in the shape of a disc composed of spiral arms extending out of the center as they rotate. Solar system is located inside such a spiral-like galaxy. In these types of galaxies, stars contain spiral signatures. Bright spiral arms found in many images taken of galaxies generally show star forming regions and not the locations of the stars themselves. That is why the exceptional quality of spiral galaxies is hidden in the continual formation and expiration process of stars. Spiral displays which show star creation regions do not revolve along other stars in the galaxy. However spiral galaxies do exhibit a special rotation. Observations point out that spiral signature within the galaxy deteriorates gradually and reshapes in a slower fashion than the galaxy rotation speed. With these new findings, it is possible to say that it is more appropriate to understand galaxies as dynamic systems which change in time instead of being static under the constant and instantaneous intervention and control of the infinite power and wisdom of the Almighty.

One of the most impressive features of spiral galaxies is that the regions where stars are created in the main spiral contain new sublevel spiral patterns. Just like clouds, it is possible for different spiral forms to be created. Sometimes very symmetric spiral arms or rectangular stick-like formations via extensions of spiral arms along with regular spiral looking shapes are generated. Despite this spiral variety, when observed from outside, stars are seen to be surrounding a flat disc and forming together as a giant globular halo. This halo was generated billions of years ago from short and longer aged stars. It is the dimmer region of the galaxy yet this halo is considered to contain most of the galactic material. Stars are located in a fashion that resembles a disc in this halo of dust and gas. The layer of dust slowly rotates around an axis that passes through the center of the halo. This rotation is not coincidental; it is controlled in such a way that the speed of stars nearby do not differ in the rotation speed of the whole disc any more than 10%. In other words, the disc does not have a constant speed. It exhibits flexibility and variations from within. Stars and gas clouds are made to revolve in similar average speeds no matter how far they are away from the center. These notions are confirmed with the use of motion laws that Newton discovered and named after himself.

Numerous types of stars from different age and mass groups exist in the disc section of a galaxy. The age of stars is determined by analyses of the light spectrum that they emit. According to the results from these analyses, the creation speed of stars has been found nearly constant around the disc section in a spiral galaxy. In many galaxies, disc material has been discovered to be around 10% gas and dust cloud and that 80-90% of the rest remains outside the disc in an invisible form, unlike stars and gasses. This is because it absorbs the majority of the light to be reflected. This kind of material is called “dark matter.” It is thought to be a very old black hole, with expired stars or an extremely cold dust cloud or a combination of these. Aside from this, it has been discussed that they are created from neutrinos or undiscovered particles. According to common notion, dark matter as generated by expired stars in the galaxy does not have any relation to the movement of spiral galaxies and their kinetic behavior, it only has gravitational effects.

Gas cloud in the disc is not dispersed proportionately; instead, it is collected in a thin layer. Furthermore, it is understood that these clouds are composed mainly of carbon, silicon, iron and many other elements, and these particles get ripped from surfaces and flown around via star winds or thrown towards interstellar space. Surprisingly, the interstellar space is a scarcely populated place. Even in areas that are considered to be empty, one atom exists in 1,000 cm3, and it can vary from one million atoms to a couple hundred per cm3 in denser regions. The density of interstellar spaces from the highest to the lowest can vary within a factor of a billion. This ratio is much greater than the density difference between air and a piece of rock.

Systems established without thermal equilibrium

Interstellar space is not in a state of thermodynamic balance. Very sizable molecular clouds are constantly shaped and get scattered into the medium. This way material exchange is carried out in between different phases on a smaller scale. Maintenance of a system where different components are preserved in a stable state with no equilibrium is a mystery to all. This elusive phenomenon has been studied by both physicists and chemists for the last 40-50 years. Data obtained so far recommends that two processes are particularly used to establish and maintain stable compounds away from an equilibrium state. The first is that such systems should include material recycling mechanisms between different components. Second is the regulation of processing speed with feedback. These two events should be executed with a balanced fashion so that the amount of material in each composition does not change. Thus, these two phenomena are executed in the most finely calibrated manner in spiral galaxies that can never be possible out of coincidence.

Plasma, one of the phases of matter, is about a couple million degrees Celsius. However, it is a much diluted phase; only one atom exists in a volume of 1,000 cm3. Temperatures rising to these levels are made possible by the energy provided from supernovas. A supernova explosion releases such energy into the space that it forms a hot gas cloud and this starts to expand. This gas cloud releases its electrons into its surroundings as it dissipates. A phase of diluted hot plasma in a bumpy shape is generated as gas cloud expands throughout the matter. One of the reasons that interstellar space took so long to be discovered is because we are still located in a hot bubble. This bubble has a magnitude of 300 light years. Studies so far have mapped this bubble and discovered it to have an irregular shape.

Aside from this, recently a new neutron star was discovered and this star is thought to be remnant of a supernova explosion that created this bubble. It should not be surprising that we are located in such a hot bubble because this only occupies 70% of our galactic disc volume. A supernova is created once every 30 or 40 years in our galaxy. Supernovas have the task of supplying the energy needed to keep the entire interstellar space under a constant pressure. It is an incredible phenomenon to ponder that a habitable planet exists in the depths of a cold space.

Interstellar spaces resemble an ecosystem from a standpoint of events that are taking place inside it. Each galaxy could be viewed as a dynamic system where stars are constantly born and extinguished in the presence of a determined cycle of energy and matter. Events that are executed with Divine wisdom in these heavenly systems (galaxies, stars, interstellar spaces) testify in their own languages to their Creator who fashioned them in the form of an art with wisdom and generously. Galaxies behave as if they are living organisms; they are born like humans and they die like humans. Continual composition and decomposition of galaxies with their contents stand as major proof to the cosmos of present and absent worlds. The heavens and the earth, the stars and galaxies all make up the Divine canvas painted and repainted on the easel of God’s command: “Be and it is.”

References

• Smolin, Lee. 1997. The Life of The Cosmos, Oxford University Press, New York.
• Syed, Ibrahim B. 2003. “Understanding String Theory,” The Fountain, Issue 41, January-March 2003.

“The most beautiful system [the universe] could only proceed from the dominion of an intelligent and powerful Being.” (Isaac Newton)

The Newtonian physics, quantum mechanics, and the theory of relativity took the modern community to the boundary of the two realms of physical and metaphysical existence. Nevertheless, the nature of the fundamental physical dimensions still remains an open question resting on the related areas of science

The fundamental concepts of Newtonian physics are Time, Length, Mass, and Electric Charge by means of which all the other classical physical quantities such as velocity, force, momentum, energy, current, electric field, magnetic flux, etc. can be derived and expressed as their combinations. Classical physics stands on the assumption that material, having two basic intrinsic properties of mass and charge, and immaterial phenomena are all contained in an absolute space and an ever-flowing absolute time. These four physical dimensions, without asking the nature of them, provide a practical framework for a description of the gravitational and electromagnetic forces and thus a description of the physical world and an interpretation of the events occurring in it up to a certain degree. However, the Newtonian picture of the universe is neither adequate for a deeper understanding of the corporeal reality nor appropriate for linking that reality to the ones possessing higher degrees of the Universal Existence.

Starting from late 19th and early 20th centuries, the Newtonian picture of the world has been changed due to two revolutionary theories, which have been proved both experimentally and theoretically that they are superior to and not compatible with the classical descriptions and assumptions. They are the relativity theory and the quantum mechanics. In physics, a field is a physical quantity associated with each point of Space-Time. For example, the Newtonian gravitational field is a vector field specifying its value at a point in Space-Time, which requires three numbers, the components of the gravitational field vector at that point. Quantum field theory constructing quantum mechanical models of systems classically parameterized by an indefinitely big number of degrees of freedom, namely fields, is the natural and quantitative language of particle physics. The current set of fundamental fields and their dynamics are summarized in a theory called the Standard Model. All particles and their interactions observed to date can be described almost entirely by the Standard Model although most particle physicists believe that it is an incomplete description of nature, and that a more fundamental theory, the Theory of Everything, awaits discovery. Figure 1 represents an overview of the various families of elementary and composite particles, and the theories describing their interactions.

The relativistic quantum field theory of the subatomic world does not only include the strong and weak nuclear forces in addition to the electromagnetic and gravitational interactions of the classical picture, but also provokes some ideas about the nature of the fundamental concepts of the classical physics. Symmetry of a physical system is a physical or mathematical feature of the system that is preserved under some change. The Standard Model says, for instance, that the electric charge is the generator of the U(1) symmetry of electromagnetism. U(1), the unitary group of rank 1, is the simplest internal symmetry group of the Standard Model. It can be visualized as the rotational symmetry of a circle about a perpendicular axis passing through the center of the circle. It represents a continuous symmetry because a circle can be rotated by an angle and remains unchanged. It is an internal symmetry since this circle does not lie in the physical space but in the complex plane of mathematics. More abstractly and more generally, a charge is any generator of a continuous symmetry of the physical system under study. When a physical system has a symmetry of some sort, Noether’s theorem implies the existence of a conserved current. The thing that flows in the current is the charge; the charge is the generator of the symmetry group. This converts our classical concrete idea of electric charge into a mathematical abstraction. Conservation of energy and conservations of linear and angular momenta are nothing but the applications of Noether’s theorem to the translational symmetry in time and translational and rotational symmetries in space, respectively.

Classically, which is equivalent to macroscopically, mass is associated with matter and can be defined as a quantitative measure of an object’s resistance to the change of its speed. But in the Standard Model of the subatomic scale, the mass of the elementary particles are explained by the Higgs mechanism which refers specifically to the generation of masses for the W and Z bosons through electroweak symmetry breaking. The Large Hadron Collider at CERN is currently searching for Higgs bosons, and attempting to understand the electroweak Higgs mechanism. The Higgs mechanism is the process that gives mass to elementary particles. In 1905, Einstein proposed mass-energy equivalence (E=mc2) in his paper entitled “Does the inertia of a body depend upon its energy-content?” In relativity, all of the energy that moves with an object (that is, all the energy which is present in the object’s rest frame) contributes to the total mass of the body, which measures how much it resists acceleration.

When we come to the remaining two fundamental concepts of Newtonian physics, we see that Time and Length, which we know instinctively, are no exceptions. The modern physics challenges our classical understandings of them too. Relativity theory argues that Time and Space are of equal ontological status; the reality is the 4-dimensional unity of Space-Time. Physics could no longer be understood as Space by itself, and Time by itself. It also states that simultaneity is relative, so there is no objective way to define a “Now” that would be the same for all states of motion which substantially affects the idea of causality. In addition, this Space-Time is not flat but rather curved due to the material and energy contained in it and not static but dynamic. Time and Space are neither uniform nor absolute.

The missing part of the so-called Theory of Everything is the quantum gravity, which attempts to develop scientific models that unify quantum mechanics describing three of the four known fundamental interactions with general relativity describing the fourth, gravity. The following quotation is from one of the leading quantum gravity researcher, Carlo Rovelli, stated in 1997:

“I believe that we are going through a period of profound confusion, in which we lack a general coherent picture of the physical world capable of embracing what or at least most of what, we have learned about it. The fundamental scientific view of the world of the present time is characterized by an astonishing amount of perplexity, and disagreement, about what time, space, matter, and causality are. But if a new synthesis is to be reached, I believe that philosophical thinking will be once more one of its ingredients. Due to the vastness of the problem involved, the generality and accuracy of philosophical thinking and its capacity to clarify conceptual premises are probably necessary to help physics out of a situation in which we have learned so much about the world, but no longer know what matter, time, space, and causality are.“

Lee Smolin, another theoretical physicist named as #21 on Foreign Policy Magazine’s 2008 list of Top 100 Public Intellectuals, stated the following in 2001:

“Atoms do fall, so the relationship between gravity and the quantum is not a problem for nature. If it is a problem for us, it must be because somewhere in our thinking there is at least one, and possibly several, wrong assumptions. At the very least, these assumptions involve our concept of space and time and the connection between the observer and the observed.”

It is true that quantum mechanics and the theory of relativity were born and are growing in the nontraditional atmosphere of the scientific enterprise. Thus, they can be considered as sharing the reductionist character of the Newtonian physics by having no direct reference to the hierarchy of physical and metaphysical existence. Nevertheless, we consider them as an improvement since they took the modern scientific community to the boundary of the two realms, by asking the old question of ancients about the nature of the fundamental physical dimensions. The mystery of them is still an open question resting, we believe, on the related areas of science and metaphysics.

A small-scale blueprint of the universe, the human body is a miraculous work of art that manifests the beautiful divine names and attributes of God Almighty. A human body is made up of a set of hierarchically organized components: an organ system, organs, tissues, cells, organelles, macromolecules, molecules, atoms, neutrons, protons, electrons, and subatomic particles. In this biological organization, it is striking to observe a proportionately allocated space between components on each level for their efficient functioning. The size of human body would be reduced if these spaces between organs, tissues, cells, and atoms could be removed, and the entire human body would not be bigger than a small ball.

The structure of an atom explains a lot concerning the real size of our body, which is filled with space. An atom is comprised of protons and neutrons in its nucleus, around which electrons continuously orbit. The mass of neutrons is almost equal to the mass of protons. Electrons, however, are 1,837 times smaller in mass than neutrons and protons. That is, almost 99.95% of the atom’s mass is in its nucleus. The mass of electrons is almost non-existent compared to the nucleus.

Both the universe and our body are filled with more hydrogen than any other atom. In each one billion atom in our body, six hundred thirty million are hydrogen atoms. In a hydrogen atom, electrons rotate only 0.53 nm (one billionth of a meter) away from the nucleus, which makes the atom’s volume to be around 6.10^-28m³, whereas the volume of the proton is 7.10^-45m³, i.e., the nucleus is only as big as one hundred quadrillionth (100.10¹⁵) of the atom’s total volume. In other words, while the nucleus comprises almost the entire mass of the atom, its volume is of no considerable size. The density of protons in the nucleus is 2,3.10¹⁷ kg/m^{3 (where does the period go here??)}, which means that there is around a hundred trillion tons of matter in only one cubic meter. If we could gather all neutrons and protons in one spot, a man who is 69 kg would be only 3.10^-7 mm³ in volume. That is, the volume the total substance of our body takes up is around one ten millionth of a cubic millimeter. The human body, which is constructed of atoms with electrons rotating on an orbit quite far away from the nucleus, is in a way no different than an “inflated space.” For a comparison, the space between the earth and the sun can be filled with as many as 107 suns, whereas 450 thousand protons are needed to fill up the distance between the proton and electron in a hydrogen atom.

The subatomic world is even more amazing. In subatomic particles are found six types of quarks. A quark is considered a fundamental constituent of matter. Combinations of quarks in different shapes and numbers result in subatomic particles, the further combinations of which produce atoms, molecules, and so on. Quarks are considered to be without mass; that is to say, they are nothing else but energy. Humans have mass, but this mass consists of quarks that are without mass.

This incredibly vast space between atoms that make up matter teaches us that our true value does not lie in our physical structure, but in the artworks of no comparison designed by the Divine as manifestations of His most beautiful names. Thus, we, who are so little in material substance, should seek other gateways in the depth of our souls and attain some value with proximity to the Divine.

We may never have revolted against God Almighty in our entire life; yet still our material minority should free us from all kinds of pride and conceit. Our physical structure is very much like the number “zero,” for 0 is also nothing, and it is drawn by inflating.

Introduction

Human beings have wrestled with questions about the origin of our existence and the fabric of our universe for thousands of years. This questioning formed the discipline of cosmology. Dr. Natarajan explores the nature of our world and shares her perspectives about how new scientific discoveries are reshaping our understanding of the universe and our place in it. Until very recently, the universe had been considered a vast empty space. But the Dark matter theory states that the universe is not empty, but rather filled with an invisible matter. As new mysteries unfold, Dr. Natarajan points out that it is our fundamental human curiosity that leaves us no choice but to explore the universe and how we fit into its grand picture.

M&B: Dr. Natarajan, you work on dark matter in the universe. What is the theory?

It turns out that the bulk of the matter in the universe is not made of ordinary atoms that you and I or the universe that we know and experience is made of, but instead made of this mysterious particle. Ninety percent of all the matter in the universe is dark matter, and we believe this is a set of particles that was created very early in the universe. These particles do not have charge, but they have mass. Since they dominate the mass of the universe, it turns out that they really form the scaffolding in the universe around which all galaxies, stars, and so on, form. They are sort of the basis or the framework within which normal atoms actually cool to form star galaxies, and then have generated us.

M&B: What is the evidence for their existence?

The reason dark matter remains a mystery, – although there is incontrovertible evidence for the existence of dark matter – is the fact that you only detect it indirectly. What I mean by that is you detect its presence because it has mass, and since it doesn’t have any charge it doesn’t couple to any radiation. So you don’t see radiation in any wavelength in the electromagnetic spectrum: no X-rays, no gamma rays, no visible light, nothing. But since dark matter has mass, it aggregates gravitationally, so they feel gravitational pull towards each other and they cluster. It’s the clustering of the dark matter, the fact that it gets compact, that we detect the effects of dark matter.

M&B: What happens near the regions where dark matter clusters? In your research papers you use the bending of the light rays. How do you observe it?

The primary evidence is the gravitational bending of light produced by these aggregates of dark matter. The universe is really composed of a smooth distribution of dark matter, with a lot of clump regions where this dark matter has aggregated, and then enabled the formation of galaxies. The presence of these large amounts of dark matter causes light from background galaxies coming towards us to bend. The actual shapes of galaxies that are behind a big clump of dark matter, which is along our line of sight, are actually distorted when we see it. The dark matter in general is smoothly distributed everywhere in the universe. But there are these particular regions that are denser. So we can look at regions in which the dark matter is not so densely distributed, look at the shapes of undistorted shapes of galaxies, and then use that to infer how much distortion we’re actually seeing when we see a lump, and infer its existence from the distortion. Because the strength of the distortion is directly proportional to the mass, you can directly infer how much mass there is between us and those objects.

M&B: Is there evidence other than the bending of the light rays?

The other evidence eludes to the fact that dark matter actually gives the basis for the formation of stars and galaxies. If you look at the motions of stars and galaxies, you find that, unlike the solar system, if you look at the velocities of the planets in the solar system as a function of distance from the sun you find that it’s falling. So the planets in the inner regions are moving very fast; they feel the gravity of the sun much more strongly than the outer planets, which are not actually moving as fast. So if you plot the velocity from the center or from the sun outwards in the solar system, the velocities are falling. Whereas if you go to a galaxy and you do the same experiment, you look at stars at different radii and you try to see what their speeds look like. They are speeding up as you go outwards. And the only way they can do that is there is something that is sitting outside the galaxy that holds it up as it were, and has gravity. And it turns out that our current picture is that most galaxies have very extended dark matter halos. The key point is that there’s a lot of dark matter sitting outside the galaxy well beyond where we see the stars.

The other compelling lines of evidence for the existence of dark matter come from larger scale observations of the universe. One of the leftovers of the big bang or relic of the big bang is this microwave background radiation that is detected today in the universe. It was a very hot radiation that has cooled with the expansion of the universe, and we are bathed in it. I mean it’s everywhere, in every direction, and measurements of the directional dependence of the microwave background shows that it’s very uniform. But in one part it’s anisotropic, so there are cool zones and hot zones in the sky. On very small scales we see these cold and hot spots. And these and isotropy’s in the microwave background are exactly predicted by this model, the cold dark matter model, which I said you know is postulated on the very early generation of the universe and these dark matter particles.

M&B: So we know that they exist. But what is their essence? What are their properties?

This is still a mysterious kind of beast. In fact, we don’t know the nature, but it appears that it’s collisionless. It’s very counterintuitive. That’s one of the things I find fascinating about the fact that it is so counterintuitive. These particles are actually collisionless. What that means is that when two dark matter particles approach each other, they pass through each other, they don’t actually bounce off of each other, so these particles don’t collide, which means they don’t have pressure, because pressure is generated by collision. So they are pressureless particles that have mass. Gravity holds them together, but they don’t actually collide.

So a current understanding of dark matter is that it’s definitely generated very early in the universe and that it clusters very strongly and it’s distributed on very different scales in the universe, so there’s like a smooth background and there are lots of clumps on top of it and so on.

M&B: As far as the mass of Dark Matter how much mass are we talking about? If there is no clustering, something like in the volume of the earth, for example, how much total dark matter mass do we have?

Well I guess the thing is at the position of the earth and at the position of the sun from the center of our galaxy. We are not really dominated by dark matter anymore, so dark matter at that radius doesn’t constitute significant portion of the mass. We are bathed in it, but the density is quite low. It’s at the innermost part of our galaxy where the density is very, very high, so we actually expect that the inner most regions of our galaxy is a very complicated, violent place where not only do you have a black hole which we know exists. This is a black hole that is not made of dark matter. This is a black hole that has gobbled gas and grown to about a million times the mass of the sun, and which is sitting at the center and it creates a very violent place for stars because it can rip them apart and so on. And this whole system is sort of embedded in this very, very dense region full of dark matter.

M&B: How is your everyday work? Where do you get data about the light rays coming near the regions with high Dark matter density?

A: I’m a theoretical person and what that means is that I actually build models but models that are guided by observations. The theory has transformed in the past 10 to 15 years because of the amount of data that technological progress has given us.

For example, the Hubbell space telescope has really transformed the kind of modeling that can be done. So I actually use data that other people have procured. They’ve cleaned it up and they give it to me. These are very distorted images of background galaxies whose shape has been distorted because of the huge amounts of dark matter that is contained in a cluster of galaxies.

M&B: The bending of the light rays is predicted by the general relativity theory. Is it what you use for your calculations?

A: It’s a beautiful theory. I think that people really have understood the iconic status of Einstein. What is most fascinating about him for me is the profound insights that he had of such despaired phenomenon. There was a way in which he was able to see connections and synthesize. You know the whole understanding that the geometry, the fate and the contents of the universe ought to be linked is a profound insight. And I think you know it’s incredible that he enabled, you know, his mind enabled him to formulate it in the way that he did, which has allowed people like me to use general relativity and the sort of elegance of general relativity because of how simple it is in fact to apply and test.

M&B: This looks like an intriguing line of work?

I want to stress that this is a particularly wonderful time for cosmology. It’s a particularly special time. I don’t want to use the sort of often abused golden age as it were, but it’s the confluence of technological progress with the kind of data that we can obtain and the level of understanding that we have built up. This is a very special time to be doing this kind of work. And while the mystery of what dark matter might be made of, you know, it may or may not get solved in my lifetime.

M&B: If you want to describe your work, what term would you use?

In a more descriptive way, I guess. What I really do is I build a story line. I build a story line for the universe. I mean, I build a story of the sequence of events of how a structure forms and assembles. The key there is that you are guided, you have a few snapshots, so you have a bit of data, but then you have to extrapolate and you make some predictions. The goal of the kind of work that I do is to make predictions, and have them be taken seriously, to either be falsified or shown to be true, and what’s exciting about this particular time is that people can falsify your theories or your models in a very short time.

M&B: Isn’t it interesting that we can actually make a story out of universe?

Well, I mean, I think that what is fascinating, and this is a personal view, what is fascinating about cosmology is the… you know it’s mystical and it’s mysterious at the same time and it’s highly abstract. It’s not intuitive because the scale that I’m working with in terms of distances, masses, and energy are just unfathomable. So there’s a real irresistible pull for certain kinds of people to do this kind of work. And I think the universe is a pretty good subject for a narrative because of the range of phenomena that occur in it. This is possibly why in all ancient civilizations there is some notion of cosmogony and this idea of fascination with where we came from. I don’t want to sound arrogant by saying that it’s the fundamental question, but you know it’s an inescapable question for anybody to ponder where we came from.

M&B: Is there a sense of awe that motivates you in your studies?

There is a sense of wonder that the universe generates and I think that you know personally for me I’m a bit of an adventurist, and I think if I can imagine myself, if I had been born 200, 300 years ago I would have been one of those explorers. And I think there are people like that amongst us always, who want to explore in different ways. I mean, there are some people who want to explore via music. And there are frontiers that they want to break through in music, and they have the creativity to do that. And I think that for a lot of us who are doing science, and cosmology in particular, there is a sense of exploration, there’s a sense of examining or grappling with things that are really at the limits of our capabilities in a way.

M&B: In some ways one of the most important fruits of the process and coming along it’s our imagination. And the human imagination is also a part of the universe.

Absolutely. It is an inescapable part of the universe and what is fascinating is the idea that we have the capability to even contemplate the origin of the universe given that we are a part of the universe.

M&B: Many people approach science in a utilitarian way and this is not what you are doing.

I think that the fact that it is not utilitarian is precisely what attracts me to it. I think it is the other side of the coin of this, which is why we probably aren’t as well funded and we ought to be better funded than we are, because this is such a fundamental human curiosity. There is enormous public interest in what we do and the level of funding that we have does not reflect that. For instance, obviously medicine is very critical. It’s critical to our existence. But the disparity in how they are funded and how the pure sciences are funded is sort of disturbing. Because I think as a culture, as a world, we can afford to indulge in understanding basic sciences partly because there are spinoffs from all the work that we do. It is unpredictable, and I think that is what’s fascinating. There are no guaranteed benefits to human kind and society today that cosmologists can bring. However, they satisfy this hunger for knowing and going beyond, you know, satisfying your hunger and thirst on a day to day basis.

Mustafa Tabanli is a producer at Ebru TV. He conducted this interview for Emmy Award winning television series Matter&Beyond.

Bio

Dr. Priya Natarajan is a Professor of Astronomy and Physics at Yale University, and an Associate at the Dark Cosmology Center, which is part of the Niels Bohr Institute at the University of Copenhagen, Denmark. Her research interests include cosmology, gravitational lensing, and black hole physics. She earned a B.A. degree in physics and mathematics at M.I.T. and her doctorate at the Institute of Astronomy, University of Cambridge in England, where she was a member of Trinity College and elected to a Title A Research Fellowship that she held from 1997 to 2003. She is currently on leave from Yale to take up her Guggenheim Fellowship. She is deeply invested in the public dissemination of science and is currently a member of the Science Advisory Board for the public television series NOVA.

http://www.astro.yale.edu/priya/