Archive for the ‘physics’ category: Page 17

Feb 14, 2023

Scientific AI’s Black Box Is No Match for 200-Year-Old Method

Posted by in categories: climatology, mathematics, physics, robotics/AI

Summary: Researchers explain how deep neural networks are able to learn complex physics.

Source: Rice University.

One of the oldest tools in computational physics — a 200-year-old mathematical technique known as Fourier analysis — can reveal crucial information about how a form of artificial intelligence called a deep neural network learns to perform tasks involving complex physics like climate and turbulence modeling, according to a new study.

Feb 12, 2023

Dark Energy Bubbles Could Explain Why The Universe Is Expanding So Fast

Posted by in categories: cosmology, physics

It’s a hot new early dark energy summer.

We’re still not sure exactly what dark energy is, but it may have played a key role in the early universe.

Physicists can’t see or measure dark energy (hence the name). The only clue that it exists is how it affects the rest of the universe; dark energy is the force that’s driving the universe to keep expanding faster. Physicists Florian Niedermann of Stockholm University and Martin Sloth of the University of Southern Denmark propose that if dark energy formed bubbles in the dark plasma of the early universe, it could solve one of the biggest mysteries in modern physics.

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Feb 12, 2023

Google’s New AI: The Age of AI-Made Movies Is Here!

Posted by in categories: physics, robotics/AI

❤️ Check out Weights & Biases and sign up for a free demo here:

📝 The paper “Phenaki — Realistic video generation from open-domain textual descriptions” is available here:

Continue reading “Google’s New AI: The Age of AI-Made Movies Is Here!” »

Feb 11, 2023

The strange number 1/137 shows up everywhere in physics. What does it mean?

Posted by in category: physics

Does it have a deeper significance — or is it just a number? Unfortunately for physics enthusiasts, 1/137 is no more significant than 3.14.

Feb 11, 2023

The Nobel Prize in Physics 1956

Posted by in categories: computing, physics

Died: 13 October 1987, Seattle, WA, USA

Affiliation at the time of the award: Bell Telephone Laboratories, Murray Hill, NJ, USA

Prize motivation: “for their researches on semiconductors and their discovery of the transistor effect”

Feb 9, 2023

Scientists Figured Out How to See the Beginning of Time

Posted by in category: physics

Pretty simple, actually.

Feb 9, 2023

If wormholes exist, they might magnify light by 100,000 times

Posted by in categories: cosmology, physics

A small team of astrophysicists affiliated with several institutions in China has found evidence that suggests if wormholes are real, they might magnify light by 100,000 times. In their paper published in the journal Physical Review Letters, the group describes the theories they have developed and possible uses for them.

Prior theoretical efforts have suggested that might exist in the , described as tunnels of a sort, connecting different parts of the universe. Some in the physics community have suggested that it may be possible to traverse such tunnels, allowing for faster-than-light travel across the universe. The researchers note that prior research has shown that black holes have such a strong gravitational pull that they are able to bend light, a phenomenon known as microlensing. They then wondered if wormholes, if they exist, also exhibit microlensing.

Proving that wormholes cause microlensing would, of course, involve first proving that wormholes exist. Still, the researchers suggest that and other theories could clarify whether the idea is even possible. In their work, they discovered that it was possible to calculate how an associated with a wormhole would warp the light passing by it. They also found theoretical evidence that wormhole would be similar to black hole lensing, which, they note, would make it difficult to tell the two apart.

Feb 9, 2023

Is space continuous or discrete?

Posted by in categories: physics, space

We’re used to thinking of space as continuous.

A stone can be anywhere in space. It can be here. Or it can be an inch to the left. Or it can be half an inch further to the left. Or it can be an infinitesimal fraction of an inch even further to the left. Space is infinitely divisible.

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Feb 9, 2023

Physicists want to use gravitational waves to ‘see’ the beginning of time

Posted by in category: physics

Gravitational waves are ripples in the fabric of space. Waves that originated in the early universe could carry important information about the phenomena that occurred there.

Feb 8, 2023

Stephen Hawking’s famous theory about black holes was proven to be true

Posted by in categories: cosmology, physics

One of Stephen Hawking’s most famous ideas has been proven to be right thanks to the ripples in space-time that were caused when two black holes far away merged. Hawking got the black hole area theorem from Einstein’s theory of general relativity in 1971. It says that a black hole’s surface area can’t go down over time. The second law of thermodynamics says that the entropy, or disorder, of a closed system must always go up. This rule is important to physicists because it seems to tell time to go in a certain direction. Since a black hole’s entropy is related to its surface area, both must always go up.

According to the new study, the fact that the researchers confirmed the area law seems to show that the properties of black holes are important clues to the hidden laws that run the universe. Surprisingly, the area law seems to go against one of the famous physicist’s proven theorems, which says that black holes should evaporate over very long periods of time. This suggests that figuring out why the two theories don’t match up could lead to new physics.

“The surface area of a black hole can’t get smaller, which is similar to the second law of thermodynamics. It also has a conservation of mass, which is similar to the conservation of energy, said the lead author, an astrophysicist from the Massachusetts Institute of Technology named Maximiliano Isi. ” At first, people were like, ‘Wow, that’s a cool parallel,’ but we quickly figured out that this was very important. The amount of entropy in a black hole is equal to its size. It’s not just a funny coincidence; they show something important about the world.” The event horizon is the point beyond which nothing, not even light, can get away from a black hole’s strong gravitational pull. Hawking’s understanding of general relativity is that a black hole’s surface area goes up as its mass goes up. Since nothing that falls into a black hole can get out, its surface area can’t go down.

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