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Archive for the ‘cosmology’ category: Page 2

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.
Subscribe for regular science videos: http://bit.ly/RiSubscRibe.

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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.

Oct 14, 2022

An Absorbing Dark Matter Experiment

Posted by in categories: cosmology, particle physics

Over the past decade, physicists have repeatedly scrutinized tanks containing tons of liquid xenon, hoping to spot the flashes of light that might indicate a collision between a dark matter particle and a xenon atom (see Viewpoint: Dark Matter Still at Large). Most of these studies were dedicated to detecting so-called weakly interacting massive particles (WIMPs), a leading dark matter candidate with a mass greater than 10 GeV. Now researchers have sifted through a new set of data for a much lighter prize: fermionic dark matter with a mass of a few tens of MeV [1]. Although the team found no signal beyond the expected background level, they have set the strongest constraints yet on models of sub-GeV fermionic dark matter.

The dataset is the first obtained by the PandaX-4T experiment at the China Jinping Underground Laboratory. The PandaX team searched this data for evidence of a beyond-the-standard-model interaction in which a fermionic dark matter particle is absorbed by the nucleus of a xenon atom. After the absorption, the xenon nucleus should recoil while emitting either a neutrino or an antineutrino. The interaction should also cause an energy deposition in the form of photons and electrons, which would register on photodetectors at the ends of the tank. Unlike the scattering of WIMPs, which is predicted to produce a broad-spectrum energy deposition, the absorption by nuclei of fermionic dark matter particles should deposit energy only in a narrow range.

The data collected so far represent the equivalent of exposing 0.6 tons of liquid xenon to hypothetical fermionic dark matter for one year. When PandaX-4T concludes in 2025, it will have achieved a cumulative exposure 10 times greater, generating even stronger constraints on theory.

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