from the world's big
Lawrence Krauss on "Seeing" the Early Universe
Theoretical physicist and cosmologist Lawrence M. Krauss spoke at CSICon 2016 about scientists' attempt to look back in time to the beginning of our universe.
At a 2016 convention hosted by the Committee for Skeptical Inquiry, theoretical physicist Lawrence M. Krauss spoke about scientists' attempts to look back to when the universe was just fractions of a second old. A few highlights from Krauss' talk are listed below, and his full presentation can be seen at the bottom of this article.
Inflation and the Universe’s “Baby Picture”
The Cosmic Microwave Background radiation (CMB) is the oldest visible light in the universe. According to Inflationary Cosmology, the CMB is essentially the afterglow radiation that was produced when the nascent universe rapidly inflated when it was some 380,000 years old.
“[The universe] went from the size of an atom to the size of a basketball in a billionth of a billionth of a billionth of a billionth of a second,” Krauss said.
Before inflation, the universe was extremely small, hot and dense. It was governed by quantum mechanics, and everything was in flux.
“When Inflation happens, all those quantum fluctuations get frozen in,” Krauss said, noting that there were tiny variations, or “lumps,” in temperature across the CMB that became the spots where galaxies and other matter formed. “[Those fluctuations] later manifest themselves in density, in matter.”
The CMB effectively confirms the Big Bang Theory — the radiation pattern looks exactly like what scientists in the mid-20th century predicted when they first theorized that the universe was once a very small, dense place.
Scientists are now trying to look farther back in time, well beyond the CMB.
“We can never see back earlier than [the CMB], and by ‘see’ I mean look with light,” Krauss said. “We have to use something that interacts much more weakly than light.”
Instead of light, scientists are using gravity to look back on the early universe.
Albert Einstein’s general theory of relativity first predicted the existence of gravitational waves, which, in simplified terms, are ripples in the fabric of spacetime caused by the acceleration of objects.
The theory of inflation predicts that the early universe would have produced certain kinds of gravitational waves. If scientists one day find evidence of these particular gravitational waves, we’d be able to ‘see’ the universe when it was just a fraction of a second old – “essentially at the Big Bang,” Krauss said.
In September 2015, scientists first detected gravitational waves disrupting spacetime. The waves came from the collision of two black holes some 1.3 billion light years away, but they were extremely hard to detect – the spacetime “wobbling” generated by the waves was so subtle that it was thousands of times smaller than the nucleus of an atom.
The video below describes how scientists at the Laser Interferometer Gravitational Wave Observatory (LIGO) first directly detected the waves in 2015.
Eternal Inflation and Multiple Universes
“If we can show that inflation happened, and we can measure the characteristics of inflation, then we know something very interesting,” Krauss said, referring to the idea of eternal inflation.
Eternal inflation suggests that, in extremely simplified terms, inflation caused the universe to expand at different rates in different places, and this gave rise to an infinite number of bubble universes. This process, according to some theorists, could go on forever.
What’s more, the laws of physics could be unique in each bubble universe. Some universes might not even have galaxies at all.
“You’ll never see these universes because they’re expanding away from us faster than light,” Krauss said. “It sounds like it’s metaphysics. But if we could measure the properties of inflation, we might be able to measure grand unification and understand particle physics, and understand those properties and prove that inflation was eternal. And if that’s the case, we will know that there must be other universes out there.”
Although we’ll never be able to see these other universes, scientists would theoretically be able to confirm their existence through indirect experiments.
“It will be like being in 1905 when Einstein first showed that atoms existed in his Ph.D. thesis,” Krauss said. “No one ever thought you’d see an atom. So we’ll turn this metaphysical explanation into physics. And that’s the beauty of science.”
Sample Melbourne's best coffee without leaving an ecological footprint.
- The massive increase in single-use coffee pods has led to an environmental catastrophe.
- Plastic pods are notorious for their inability to break down in landfills.
- Thankfully, a new wave of eco-friendly compostable pods is coming to the market.
Can an orgasm a day really keep the doctor away?
- Achieving orgasm through masturbation provides a rush of feel-good hormones (such as dopamine, serotonin and oxytocin) and can re-balance our levels of cortisol (a stress-inducing hormone). This helps our immune system function at a higher level.
- The surge in "feel-good" hormones also promotes a more relaxed and calm state of being, making it easier to achieve restful sleep, which is a critical part in maintaining a high-functioning immune system.
- Just as bad habits can slow your immune system, positive habits (such as a healthy sleep schedule and active sex life) can help boost your immune system which can prevent you from becoming sick.
How masturbation affects your brain...<p>Orgasms are a very common human phenomenon. The physical and mental health benefits have been researched frequently as a result, and yet, there is still so much to be learned about how our bodies and brains react to the chemicals and hormones released during and after experiencing this type of sexual release.</p><p>"The amount of speculation versus actual data on both the function and value of orgasm is remarkable" explains Julia Heiman, director of the <a href="https://kinseyinstitute.org/" target="_blank">Kinsey Institute for Research in Sex, Gender, and Reproduction</a>.</p><p>Masturbation causes a rush of <a href="https://www.webmd.com/mental-health/what-is-dopamine" target="_blank">dopamine</a>, which is a chemical that is associated with our ability to feel pleasure. Along with the rush of dopamine that is released during an orgasm, there is also a release of a hormone called <a href="https://www.livescience.com/42198-what-is-oxytocin.html" target="_blank">oxytocin</a>, which is commonly referred to as the "love hormone."<br></p><p>This concoction of chemicals does more than just boost our mood, it also can play a key role in decreasing stress and promoting relaxation. Oxytocin decreases <a href="https://www.webmd.com/a-to-z-guides/what-is-cortisol" target="_blank">cortisol</a>, which is a stress hormone that is usually present (in high volumes) during times of anxiety, fear, panic, or distress. </p><p>According to BDSM and fetish researcher <a href="https://www.psychologytoday.com/us/therapists/dr-gloria-brame-colbert-ga/278388" target="_blank">Dr. Gloria Brame</a>, an orgasm is the biggest non-drug induced blast of dopamine that we can experience. </p><p>By boosting the oxytocin and dopamine levels and subsequently decreasing our cortisol levels, the brain is placed in a more relaxed, euphoric, and calm state. </p>
Masturbation boosts your immune system and raises your white blood cell count.<p>How do those effects on the brain from reaching orgasm translate to boosting our immune system and making our body healthier?</p><p>The increase of oxytocin and dopamine that causes a decrease in cortisol levels can help boost our immune system because cortisol (well-known for being a stress-inducing hormone) actually helps maintain your immune system if released in small doses. </p><p>According to <a href="https://www.health24.com/Sex/Great-sex/incredible-health-benefits-to-masturbating-20181030-2" target="_blank">Dr. Jennifer Landa</a>, a hormone-therapy specialist, masturbation can produce the right kind of environment for a strengthened immune system to thrive. </p><p><a href="https://www.ncbi.nlm.nih.gov/pubmed/15316239" target="_blank">A study</a> conducted by the Department of Medical Psychology at the University Clinic of Essen (in Germany) showed similar results. A group of 11 volunteers were asked to participate in a study that would look at the effects of orgasm through masturbation on the white blood cell count and immune system.</p><p>During this experiment, the white blood cell count of each participant was analyzed through measures that were taken 5 minutes before and 45 minutes after reaching a self-induced orgasm. </p><p>The results confirmed that sexual arousal and orgasm increased the number of white blood cells, particularly the natural killer cells that help fight off infections. </p><p>The findings confirm that our immune system is positively affected by sexual arousal and self-induced orgasm and promote even more research into the positive impacts of sexual arousal and orgasm. </p>
Masturbation can ease and prevent pain, which allows you to achieve the restful sleep that helps your immune system stay strong and healthy.<p>The benefits of masturbation have long been debated, but the more research that is done on the topic the more we understand that there are many positive reactions that happen in our bodies and brains when we orgasm.</p><p>Orgasms can help prevent or mitigate pain, which boosts the immune system, preventing cold and flu symptoms. </p><p>According to neurologist and headache specialist Stefan Evers, about one in three patients experience relief from migraine attacks by experiencing sexual activity or orgasm. Evers and his team <a href="https://www.livescience.com/27642-sex-relieves-migraine-pain.html" target="_blank">conducted an experiment</a> with 800 migraine patients and 200 patients who suffered from cluster-headaches to see how their experiences with sexual activity impacted their pain levels. </p><p>The study showed that 60% of migraine sufferers experienced pain relief after participating in sexual activity that resulted in orgasm. Of the cluster-headache sufferers, about 50% said their headaches actually worsened after sexual arousal and orgasm. </p><p>Evers suggested in his findings that the people who did not experience pain relief from migraines of headaches during their sexual activity did not release as large amounts of endorphins as those who did experience pain relief. </p><p>According to <a href="https://www.sharecare.com/health/chronic-pain/chronic-pain-affect-immune-system" target="_blank">rheumatologist Dr. Harris McIlwain</a>, people who suffer from chronic pain have immune systems that are simply not functioning at full capacity - therefore, alleviating pain (through orgasm, as an example) can help boost the immune system. </p><p>Orgasms can also promote relaxation and make it easier to fall asleep. Serotonin, oxytocin, and norepinephrine are all hormones that are released during sexual arousal and orgasm, and all three are known for counteracting stress hormones and promoting relaxation, which makes it much easier for you to fall asleep.</p><p>There are <a href="https://www.ncbi.nlm.nih.gov/pubmed/1233384" target="_blank">several studies</a> showing that serotonin and norepinephrine help our body cycle through REM and deep non-REM sleeping cycles. During these sleep cycles, the immune system releases proteins called <a href="https://www.sleepfoundation.org/articles/how-sleep-affects-your-immunity" target="_blank"><span id="selection-marker-1" class="redactor-selection-marker"></span>cytokines<span id="selection-marker-2" class="redactor-selection-marker"></span></a>, which target infection and inflammation. This is a critical part of our immune response. Cytokines are both produced and released throughout our bodies while we sleep, which proves the importance of a good sleep schedule to a healthy immune system.</p>
Masturbation promotes a high-functioning immune system; a healthy immune system prevents cold and flu.<p>The immune system is a balanced network of cells and organs that work together to defend you against infections and diseases by stopped threats like bacteria and viruses from entering your system. While there are many things we need to do to keep our immune systems functioning at optimal levels, masturbation (or other means of achieving orgasm) has proven to have positive effects on the immune system as a whole.</p><p>Just as bad habits (such as an inconsistent sleep schedule or harmful chemicals in your body) can slow your immune system, positive habits (such as a healthy sleep schedule and active sex life) can help boost your immune system. </p>
Workers are adjusting to their new employment reality on couches and kitchen tables across the nation.
A new study suggests that an old tuberculosis vaccine may reduce the severity of coronavirus cases.
- A new study finds a country's tuberculosis BCG vaccination is linked to its COVID-19 mortality rate.
- More BCG vaccinations is connected to fewer severe coronavirus cases in a country.
- The study is preliminary and more research is needed to support the findings.
Professor Luis Escobar.
Credit: Virginia Tech