Archive for the ‘cosmology’ category: Page 6

Oct 9, 2023

New Way for a Black Hole to be a Messy Eater

Posted by in category: cosmology

Simulations indicate an erratic and copious accretion of gas onto a black hole when the surrounding disk is tilted and the black hole spins rapidly.

Oct 8, 2023

Weird dark matter waves seem to warp the light from distant galaxies

Posted by in categories: cosmology, particle physics

Ultralight dark matter particles that behave like waves, called axions, seem to be a better match for gravitational lensing measurements than more traditional explanations for dark matter.

By Leah Crane

Oct 8, 2023

Scientists untangle mystery about the universe’s earliest galaxies

Posted by in categories: computing, cosmology

WASHINGTON, Oct 6 (Reuters) — Since beginning operations last year, the James Webb Space Telescope has provided an astonishing glimpse of the early history of our universe, spotting a collection of galaxies dating to the enigmatic epoch called cosmic dawn.

But the existence of what appear to be massive and mature galaxies during the universe’s infancy defied expectations — too big and too soon. That left scientists scrambling for an explanation while questioning the basic tenets of cosmology, the science of the origin and development of the universe. A new study may resolve the mystery without ripping up the textbooks.

The researchers used sophisticated computer simulations to model how the earliest galaxies evolved. These indicated that star formation unfolded differently in these galaxies in the first few hundred million years after the Big Bang event 13.8 billion years ago that initiated the universe than it does in large galaxies like our Milky Way populating the cosmos today.

Oct 7, 2023

Saturday Citations: Hippo maxillofacial issues; implicit biases in the game of kings; AI masters Street Fighter

Posted by in categories: cosmology, physics, robotics/AI

They announced the Nobel prizes this week! But did any of the recipients teach an AI to play Street Fighter? Here are a few of this week’s stories not yet lauded by international committees of scientists, but which we thought were pretty good:

Even if you think a galaxy is old enough to drink, you should probably go ahead and ask for ID before you serve them. The earliest galaxies in the universe captured by the James Webb Space Telescope appeared too bright, massive and way too old to have formed that soon after the Big Bang, presenting a problem for astronomers and their favorite model, the standard model of cosmology.

Recently, a team of physicists at Northwestern University used computer simulations to model galaxy formation after the Big Bang and demonstrate that (at least in the model universe) stars formed in bursts, producing light of enormously greater intensity than a modern galaxy like, say, Andromeda, where is steady and the number of stars gradually increases over time.

Oct 7, 2023

Pulsars may make dark matter glow

Posted by in categories: cosmology, particle physics

The central question in the ongoing hunt for dark matter is: what is it made of? One possible answer is that dark matter consists of particles known as axions. A team of astrophysicists, led by researchers from the universities of Amsterdam and Princeton, has now shown that if dark matter consists of axions, it may reveal itself in the form of a subtle additional glow coming from pulsating stars. Their work is published in the journal Physical Review Letters.

Dark matter may be the most sought-for constituent of our universe. Surprisingly, this mysterious form of matter, that physicist and astronomers so far have not been able to detect, is assumed to make up an enormous part of what is out there.

No less than 85% of matter in the universe is suspected to be “dark,” presently only noticeable through the gravitational pull it exerts on other astronomical objects. Understandably, scientists want more. They want to really see dark matter—or at the very least, detect its presence directly, not just infer it from gravitational effects. And, of course: they want to know what it is.

Oct 6, 2023

QBism and the philosophical crisis of quantum mechanics

Posted by in categories: computing, cosmology, quantum physics

The famous Copenhagen Interpretation favored by the founders of quantum mechanics is most definitely psi-epistemic. Niels Bohr, Werner Heisenberg, and others saw the state vector as being related to our interactions with the Universe. As Bohr said, “Physics is not about how the world is; it is about what we can say about the world.”

QBism is also definitively psi-epistemic, but it is not the Copenhagen Interpretation. Its epistemic focus grew organically from its founders’ work in quantum information science, which is arguably the most important development in quantum studies over the last 30 years. As physicists began thinking about quantum computers, they recognized that seeing the quantum in terms of information — an idea with strong epistemic grounding — provided new and powerful insights. By taking the information perspective seriously and asking, “Whose information?” the founders of QBism began a fundamentally new line of inquiry that, in the end, doesn’t require science fiction ideas like infinite parallel universes. That to me is one of its great strengths.

But, like all quantum interpretations, there is a price to be paid by QBism for its psi-epistemic perspective. The perfectly accessible, perfectly knowable Universe of classical physics is gone forever, no matter what interpretation you choose. We’ll dive into the price of QBism next time.

Oct 6, 2023

Where Is the Rest of the Universe Hidden?

Posted by in categories: cosmology, physics

The universe is expanding, but why? Dark Energy might be the key in solving this mystery.
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Oct 6, 2023

James Webb Telescope Just Announced First Ever Black Hole at the Edge of the Universe

Posted by in category: cosmology

“The Universe Came From a Black Hole” String Theory Founder Reveals James Webb Telescope’s New Image. Deep within dense star clusters, something extraordinary dwells: Stars. But these, are no ordinary stars, but colossal celestial beings, known as supermassive stars. And now, their existence has been unveiled by the piercing gaze of the James Webb Space Telescope.

According to the standard model of cosmology, after the universe came out of the big bang, it took between 500 million to 1 billion years for the first stars to form. That however, is changing.

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Oct 4, 2023

Joscha Bach: Artificial Consciousness and the Nature of Reality

Posted by in categories: cosmology, existential risks, government, robotics/AI

Joscha Bach is the VP of Research at the AI Foundation, previously doing research at MIT and Harvard. Joscha work explores the workings of the human mind, intelligence, consciousness, life on Earth, and the possibly-simulated fabric of our universe.

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Oct 1, 2023

Radio telescope will launch to moon’s far side in 2025 to hunt for the cosmic Dark Ages

Posted by in category: cosmology

The radio astronomy experiment LuSEE-Night will test technologies for radio telescopes on the far side of the moon.

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