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Archive for the ‘cosmology’ category: Page 188

Oct 16, 2022

This is why quantum physicists suspect the Multiverse very likely exists

Posted by in categories: cosmology, quantum physics

One of the most successful theories of 20th century science is cosmic inflation, which preceded and set up the hot Big Bang. W e also know how quantum fields generally work, and if inflation is a quantum field (which we strongly suspect it is), then there will always be more “still-inflating” space out there. Whenever and wherever inflation ends, you get a hot Big Bang. If inflation and quantum field theory are both correct, a Multiverse is a must.

When we look out at the Universe today, it simultaneously tells us two stories about itself. One of those stories is written on the face of what the Universe looks like today, and includes the stars and galaxies we have, how they’re clustered and how they move, and what ingredients they’re made of. This is a relatively straightforward story, and one that we’ve learned simply by observing the Universe we see.

But the other story is how the Universe came to be the way it is today, and that’s a story that requires a little more work to uncover. Sure, we can look at objects at great distances, and that tells us what the Universe was like in the distant past: when the light that’s arriving today was first emitted. But we need to combine that with our theories of the Universe — the laws of physics within the framework of the Big Bang — to interpret what occurred in the past. When we do that, we see extraordinary evidence that our hot Big Bang was preceded and set up by a prior phase: cosmic inflation. But in order for inflation to give us a Universe consistent with what we observe, there’s an unsettling appendage that comes along for the ride: a multiverse. Here’s why physicists overwhelmingly claim that a multiverse must exist.

Oct 16, 2022

The parallel worlds of quantum mechanics

Posted by in categories: cosmology, quantum physics

There are many ways to interpret quantum mechanics, each weirder than the last. Theoretical physicist Sean Carroll says that the most plausible is the Many-Worlds theory.

The idea that an infinite number of parallel worlds could exist alongside our own is hard to wrap the mind around, but a version of this so-called Many Worlds theory could provide an answer to the controversial idea of quantum mechanics and its many different interpretations.

Bill Poirier, a professor of physics at Texas Tech University in Lubbock, proposed a theory that not only assumes parallel worlds exist, but also says their interaction can explain all the quantum mechanics “weirdness” in the observable universe.

Oct 16, 2022

What Drives Galaxies? The Milky Way’s Black Hole May Be the Key

Posted by in categories: cosmology, physics

On May 12, at nine simultaneous press conferences around the world, astrophysicists revealed the first image of the black hole at the heart of the Milky Way. At first, awesome though it was, the painstakingly produced image of the ring of light around our galaxy’s central pit of darkness seemed to merely prove what experts already expected: The Milky Way’s supermassive black hole exists, it is spinning, and it obeys Albert Einstein’s general theory of relativity.

And yet, on closer inspection, things don’t quite stack up.

Oct 15, 2022

A student asked her cosmology professor the meaning of life. Here was his response

Posted by in categories: cosmology, physics

In this excerpt from “Cosmogenesis,” cosmologist Brian Thomas Swimme explains how physics can approach questions about meaning in life.

Oct 15, 2022

Huge, unusually powerful explosion in space just detected by scientists

Posted by in category: cosmology

An artist’s conception of a supernova explosion. Credit: NASA’s Goddard Space Flight Center / ESA / Hubble / L. Calcada In space, things frequently go boom. And recently, on Oct. 9, astronomers observed an extraordinarily colossal boom. NASA’s Swift Observatory, which is specifically designed to spot the most powerful known explosions in the universe today — called gamma-ray bursts — detected an extremely strong such burst.

Oct 14, 2022

Astronomers just found the remains of one of the universe’s first stars

Posted by in categories: chemistry, cosmology

The star exploded in an epic supernova, and its debris still shapes the chemical makeup of a distant quasar, a new study reports.

Oct 14, 2022

(podcast) A conversation with Rizwan Virk

Posted by in category: cosmology

Listen now (82 min) | Moravec and Everett meet Borges and Dick in a multiverse of many simulated worlds.

Oct 14, 2022

The origin of our universe from the multiverse — with Laura Mersini-Houghton

Posted by in categories: cosmology, nuclear energy, quantum physics

Join cosmologist Laura Mersini-Houghton as she discusses her ground-breaking theory, and how her path from communist Albania helped her become one of the most courageous thinkers on the world stage of theoretical physics. Watch the Q&A for this video here: https://youtu.be/6xpVP_ITEYE

Laura’s book “Before the Big Bang: The Origin of Our Universe from the Multiverse” is available to purchase now: https://geni.us/2TDDa.
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Oct 14, 2022

Ancient heart of milky way discovered

Posted by in categories: cosmology, quantum physics

Black Holes Could Hold a Surprising Secret About Our UniverseTake gravity and mix it with quantum mechanics.

Oct 14, 2022

Potential Dark Matter Signal Gives Way to New Limits

Posted by in categories: cosmology, particle physics

Results from two leading dark matter experiments—XENONnT and PandaX-4T—rule out an enigmatic signal detected in 2020 and set new constraints on dark matter particle candidates consisting of light fermions, respectively.