Archive for the ‘cosmology’ category

Jun 1, 2023

Another Major Dark Matter Mystery Challenges Scientists

Posted by in category: cosmology

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Hello and welcome! My name is Anton and in this video, we will talk about a strange discovery of excess of dark matter and other related mysteries.
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May 31, 2023

Signs of a Critical Imbalance in Physics Seen in The Arrangements of Galaxies

Posted by in categories: cosmology, physics

Physicists have long puzzled over why there is more matter in the Universe than its flipped twin, antimatter. Without this imbalance, the two types of material would have canceled out, leaving nothing but a boring glow in the vast emptiness of space.

Somehow, at some point, something changed in the way the Universe works on a fundamental level, favoring the mirrored state – or parity – of one kind of ‘stuff’ over the other.

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May 31, 2023

A Cosmic Conundrum: The Black Hole That Creates Stars, Defying Conventional Wisdom

Posted by in category: cosmology

A recent discovery made by astronomers operating the Hubble Space Telescope has revealed the presence of a black hole at the center of a dwarf galaxy that actually creates stars instead of consuming them. This revelation has challenged the common perception that black holes only destroy matter.

The method by which stars are formed in this particular dwarf galaxy, named Henize 2–10, is fundamentally different from how stars are formed in larger galaxies. Astronomers have observed that gas moves around the black hole before merging with a core of dense gas present in the galaxy.

The Hubble spectroscopy revealed that the outflow of this gas was traveling at a rate of a million miles per hour, which eventually collided with the dense gas present in the galaxy. The outflow created clusters of newly born stars on its path.

May 31, 2023

Meet “Vacuum Decay” — The Most Spectacular End To The Universe

Posted by in categories: cosmology, particle physics, quantum physics

There is a lot of speculation about the end of the universe. Humans love a good ending after all. We know that the universe started with the Big Bang and it has been going for almost 14 billion years. But how the curtain call of the cosmos occurs is not certain yet. There are, of course, hypothetical scenarios: the universe might continue to expand and cool down until it reaches absolute zero, or it might collapse back onto itself in the so-called Big Crunch. Among the alternatives to these two leading theories is “vacuum decay”, and it is spectacular – in an end-of-everything kind of way.

While the heat death hypothesis has the end slowly coming and the Big Crunch sees a reversal of the universe’s expansion at some point in the future, the vacuum decay requires that one spot of the universe suddenly transforms into something else. And that would be very bad news.

There is a field that spreads across the universe called the Higgs field. Interaction between this field and particles is what gives the particles mass. A quantum field is said to be in its vacuum state if it can’t lose any energy but we do not know if that’s true for the Higgs field, so it’s possible that the field is in a false vacuum at some point in the future. Picture the energy like a mountain. The lowest possible energy is a valley but as the field rolled down the slopes it might have encountered a small valley on the side of that mountain and got stuck there.

May 31, 2023

Black Holes Might Really Be Giant Structures Made of Spacetime, Physicists Propose

Posted by in categories: cosmology, physics

“It’s an interesting question to ask: Are there things other than a black hole” that “will give you a hint about what new physics could look like?” added Bah. “But before you get there, you need to know how to tell whether you have a black hole or not, and to do that you have some prototype examples of things that are not black holes to be able to compare.”

Black holes are among the most fascinating and puzzling objects ever observed in our universe. These massive compact entities have so much gravitational power that nothing, not even light, can escape beyond their borders, known as the event horizon. Scientists have imaged black holes with the Event Horizon Telescope and have captured the ripples that these objects make in spacetime, which are called gravitational waves.

May 31, 2023

Before the Big Bang 11: Is the Universe a Time Machine?

Posted by in categories: cosmology, evolution, quantum physics, time travel

What happened before the Big Bang? In two of our previous films we examined cyclic cosmologies and time travel universe models. Specially, the Gott and Li Model and Penrose’s Conformal Cyclic Cosmology Recently Beth Gould and Niayesh Afshordi of the Perimeter Institute for Theoretical Physics have fused these two models together to create a startling new vision of the universe. In this film they explain their new proposal, known as Periodic Time Cosmology.

0:00 Introduction.
0:45 NIayesh’s story.
1:15 Beth’s story.
2:25 relativity.
3:26 Gott & Li model.
6:23 origins of the PTC model.
8:17 PTC periodic time cosmology.
10:55 Penrose cyclic model.
13:01 Sir Roger Penrose.
14:19 CCC and PTC
15:45 conformal rescaling and the CMB
17:28 assumptions.
18:41 why a time loop?
20:11 empirical test.
23:96 predcitions.
26:19 inflation vs PTC
30:22 gravitational waves.
31:40 cycles and the 2nd law.
32:54 paradoxes.
34:08 causality.
35:17 immortality in a cyclic universe.
38:02 eternal return.
39:21 quantum gravity.
39:57 conclusion.

Continue reading “Before the Big Bang 11: Is the Universe a Time Machine?” »

May 28, 2023

Schrodinger’s black hole? Quantum properties of stellar bodies revealed

Posted by in categories: cosmology, quantum physics

Year 2022 😗

A team of researchers found that a simulated black hole could have multiple masses simultaneously.

May 28, 2023

Semi-Visible Particle Jets: Is Dark Matter Hiding in Plain Sight?

Posted by in categories: cosmology, particle physics

What happens if dark-matter particles are produced inside a jet of Standard-Model particles? This leads to a novel detector signature known as semi-visible jets! The ATLAS Collaboration has come up with the first search for semi-visible jets, looking for them in a general production mode where two protons interact by exchanging an intermediate particle, which is then converted into two jets.

The elusive nature of dark matter remains one of the biggest mysteries in particle physics. Most of the searches have so far looked for events where a “weakly interacting” dark-matter particle is produced alongside a known Standard-Model particle. Since the dark-matter particle cannot be seen by the ATLAS detector, researchers look for an imbalance of transverse momentum (or “missing energy”).

May 28, 2023

Scientists create matter from nothing in groundbreaking experiment

Posted by in categories: cosmology, particle physics, quantum physics

We’ve probably all heard the phrase you can’t make something from nothing. But in reality, the physics of our universe isn’t that cut and dry. In fact, scientists have spent decades trying to force matter from absolutely nothing. And now, they’ve managed to prove that a theory first shared 70 years ago was correct, and we really can create matter out of absolutely nothing.

The universe is made up of several conservation laws. These laws govern energy, charge, momentum, and so on down the list. In the quest to fully understand these laws, scientists have spent decades trying to figure out how to create matter – a feat that is far more complex than it even sounds. We’ve previously turned matter invisible, but creating it out of nothing is another thing altogether.

There are many theories on how to create matter from nothing – especially as quantum physicists have tried to better understand the Big Bang and what could have caused it. We know that colliding two particles in empty space can sometimes cause additional particles to emerge. There are even theories that a strong enough electromagnetic field could create matter and antimatter out of nothing itself.

May 27, 2023

This new supernova, the brightest in years, could help astronomers forecast future star explosions

Posted by in categories: cosmology, futurism

A new supernova has turned into the most watched phenomenon in the May night sky. The close proximity of the stellar explosion and the vast amount of observations gathered since the discovery promise to advance astronomers’ understanding of stellar evolution and could even lead to major advances in supernova forecasting.

Supernovas are powerful explosions in which very massive stars, at least eight times more massive than our sun, die when they use up all the hydrogen fuel in their cores. The discovery of this latest exploding star, known officially as 2023ifx, was a serendipitous one.

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