Brane Cosmology

Physicists hope that understanding the churning region near singularities might help them reconcile gravity and quantum mechanics.

One of the biggest revelations from the MIT physicist Netta Engelhardt's work is that information that falls into a black hole isn't necessarily lost forever. She is now tackling other questions about gravity, hoping to fill the last, largest gaps in physicists' understanding of the universe at the most fundamental scales.

Scientists think we could live in a giant void, a less-dense bubble leftover from the Big Bang. If so, it could explain the expansion rate of the universe. The post Could a giant void explain the universe's expansion? first appeared on EarthSky.

The first results from the James Webb Space Telescope have hinted at galaxies so early and so massive that they are in tension with our understanding of the formation of structure in the Universe. Various explanations have been proposed that may alleviate this tension. But now a new study from the C

Dark matter—an invisible form of matter that scientists only know exists due to its gravitational pull—makes up an estimated 80 percent of our universe.

Supersymmetry, long considered the golden child of theoretical physics, has officially lost its luster at the world's reigning particle accelerator

There's a significant imbalance between matter and antimatter in our universe, but a strange particle called "the Majoran" could finally explain it, an audacious new study suggests.

The universe's light-starved early epochs, as well as the first stars and galaxies, lie beyond the reach of conventional observatories but could be revealed by a new generation of radio telescope arrays

The idea of emergent gravity is still new and requires a lot of assumptions in its calculations to make it work. But if experimental evidence ever proves it real, we would need to totally rewrite the laws of physics.

When two lead ions collide at the Large Hadron Collider (LHC), they produce an extremely hot and dense state of matter in which quarks and gluons are not confined inside composite particles called hadrons. This fireball of particles—known as quark–gluon plasma and believed to have filled the universe in the first few millionths of a second after the Big Bang—expands and cools down rapidly. The quarks and gluons…

We may never have satisfying answers.

The top quark also experiences quantum entanglement, according to new discoveries by CERN.

One of the biggest mysteries in cosmology is the rate at which the universe is expanding. One possible explanation: That we live in a giant void in space (an...

The cosmological principle (CP)—the notion that the Universe is spatially isotropic and homogeneous on large scales—underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lemaître-Robertson-Walker (FLRW) cosmologies as the spacetime metric, and culminates in the successful and highly predictive Λ-Cold-Dark-Matter (ΛCDM) model. Yet, tensions have emerged within the ΛCDM…

How did the universe begin is a question as old as time. Take your pick from these possible theories and you'll be in good company with world-renowned physicists.

Article URL: https://greyenlightenment.com/2022/10/30/the-hidden-underachievers-and-the-limits-of-the-meritocracy/ Comments URL: https://news.ycombinator.com/item?id=33414298 Points: 1 # Comments: 0

The universe is constantly expanding, but how do scientists think about what it's expanding into?

Our best observations can't come up with a single answer for how quickly the universe is expanding. Maybe that's because our galaxy is at the center of a giant void.

Article URL: https://www.math.columbia.edu/~woit/wordpress/?p=13487 Comments URL: https://news.ycombinator.com/item?id=35867701 Points: 1 # Comments: 0

Seeing is more than believing: Holography helps our understanding of our early universe. A team of researchers at Kyoto University is exploring the use of higher dimensions in de Sitter space to explain gravity in the early universe. By developing a method to compute correlation functions among flu