Dive into the fascinating world of Boltzmann Brains in our latest explainer video, “Boltzmann Brains: Consciousness in the Cosmos Explained!” 🌌 We unravel t…
Category: physics – Page 38
Baffling discovery about the universe expanding defies our understanding of physics
A new study has revealed the universe is expanding too quickly for our current understanding of physics to explain.
The expansion of the universe is described using a unit of measurement called the Hubble constant. Determining the universe’s expansion rate has been a major point of intrigue since 1929, when Edwin Hubble first discovered that our universe is expanding.
The universe began with the Big Bang, a rapid expansion from an initial state of high density and pressure.
Delocalized states within the superconducting gap
More than a decade ago, researchers discovered that when they added boron to the carbon structure of diamond, the combination was superconductive. Since then, growing interest has been generated in understanding these superconducting properties.
With this interest, a research group in India focused on a Fano resonance in a heavily boron-doped diamond (BDD) that involves the vibrational mode of diamond. The researchers, from the Indian Institute of Technology Madras, report their findings this week in Applied Physics Letters.
In probing the vibrational properties of BDD films, the researchers used Raman scattering and presented a comprehensive analysis of the Fano effect as a function of boron concentration and the excitation frequency used in the Raman measurement.
Using AI, researchers devise a fast and precise way to teach robots complicated skills
At UC Berkeley, researchers in Sergey Levine’s Robotic AI and Learning Lab eyed a table where a tower of 39 Jenga blocks stood perfectly stacked. Then a white-and-black robot, its single limb doubled over like a hunched-over giraffe, zoomed toward the tower, brandishing a black leather whip.
Through what might have seemed to a casual viewer like a miracle of physics, the whip struck in precisely the right spot to send a single block flying out from the stack while the rest of the tower remained structurally sound.
This task, known as “Jenga whipping,” is a hobby pursued by people with the dexterity and reflexes to pull it off. Now, it’s been mastered by robots, thanks to a novel, AI-powered training method.
Time Travel, Invisibility, and Teleportation… Are They Possible?(Can the Impossible Be Achieved)
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#PhysicsOfTheImpossible.
#MichioKaku.
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#FutureTech.
#Physics Can the impossible be achieved scientifically? In this video, we explore the fascinating ideas from Physics of the Impossible by theoretical physicist Michio Kaku. We’ll discuss concepts like time travel, invisibility, and teleportation—could they become reality in the future?
If you’re a fan of science fiction and physics, this video is for you! Don’t forget to subscribe and turn on notifications for more exciting content.
📌 Topics Covered:
✔️ What is Physics of the Impossible?
✔️ The three categories of scientific impossibilities.
✔️ Is time travel possible?
✔️ Sci-fi technologies that may become real.
📚 Sources & References:
Physics of the impossible by michio kaku.
Amazon link to the book.
REAL Warp Drives? NEW research proposes a solution!
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Two new recently published, peer-reviewed scientific papers show that real warp drive designs based on real physics may be possible. They are realistic and physical, which had not been the case in the past. In a paper published in 1994, Mexican physicist Miguel Alcubierre showed theoretically that an FTL warp drive could work within the laws of physics. But it would require huge amounts of negative mass or energy. Such a thing is not known to exist.
0:00 Problem with C
2:21 General Relativity.
3:15 Alcubierre warp.
4:40 Bobrick & Martire solution.
7:15 Types of warp drives.
8:42 Spherical Warp drive.
11:32 FTL using Positive Energy.
13:14 Next steps.
14:08 Further education Brilliant.
In a recent paper published by Applied Physics, authors Alexey Bobrick and Gianni Martire, outline how a physically feasible warp drive could in principle, work, without the need for negative energy. I spoke to them. They had technical input on this video.
What Alcubierre did in his paper is figure out a shape that he believed spacetime needed to have in order for a ship to travel faster than light. Then he solved Einstein’s equation for general relativity to determine the matter and energy he would need to generate the desired curvature. It could only work with negative energy. This is mathematically consistent, but meaningless because negative mass is not known to exist. Negative mass is not the same as anti-matter. Antimatter has positive energy and mass.
Even if you could create the Alcubierre curvature, you still need to accelerate the ship to speed of light and beyond. But to go beyond C, you have to have superluminal matter, or infinite energy. This is not possible.
What Bobrick and Martire figured out is that there is more than one type of warp drive. We can get to Proxima Centauri in 10 months without going faster than light, by dilating time inside the ship. If a spaceship is constructed of a massive super dense material, close to the mass density of a neutron star, then any individuals inside this ship would experience significant time dilation. Passengers on such a ship could go to Proxima Centauri in about 9 earth years traveling at half the speed of light, but only about 10 months would have passed from their perspective. But a huge amount of mass would still be needed, on the order of about the mass of Jupiter or larger.
Neural network cuts cost of engineering simulations
When astronomers detected the first long-predicted gravitational waves in 2015, it opened a whole new window into the universe. Before that, astronomy depended on observations of light in all its wavelengths.
We also use light to communicate, mostly radio waves. Could we use gravitational waves to communicate?
The idea is intriguing, though beyond our capabilities right now. Still, there’s value in exploring the hypothetical, as the future has a way of arriving sooner than we sometimes think.
Communicating with Gravitational Waves
When astronomers detected the first long-predicted gravitational waves in 2015, it opened a whole new window into the Universe. Before that, astronomy depended on observations of light in all its wavelengths.
We also use light to communicate, mostly radio waves. Could we use gravitational waves to communicate?
The idea is intriguing, though beyond our capabilities right now. Still, there’s value in exploring the hypothetical, as the future has a way of arriving sooner than we sometimes think.
Researchers Unveil How Our Brains Decode Space and Time
A study by cognitive neuroscientists at SISSA investigated how the human brain processes space and time, uncovering that these two types of information are only partially connected.
Imagine a swarm of fireflies flickering in the night. How does the human brain process and integrate information about both their duration and spatial position to form a coherent visual experience? This question was the focus of research by Valeria Centanino, Gianfranco Fortunato, and Domenica Bueti from SISSA’s Cognitive Neuroscience group, published in Nature Communications
<em> Nature Communications </em> is an open-access, peer-reviewed journal that publishes high-quality research from all areas of the natural sciences, including physics, chemistry, Earth sciences, and biology. The journal is part of the Nature Publishing Group and was launched in 2010. “Nature Communications” aims to facilitate the rapid dissemination of important research findings and to foster multidisciplinary collaboration and communication among scientists.
Super-Earth discovery reveals an exoplanet potentially capable of sustaining life
Thirty years after the discovery of the first exoplanet, astronomers have detected more than 7,000 of them in our galaxy. But there are still billions more to be discovered. At the same time, exoplanetologists have begun to take an interest in their characteristics, with the aim of finding life elsewhere in the universe. This is the background to the discovery of super-Earth HD 20,794D by an international team including the University of Geneva (UNIGE) and the NCCR PlanetS.
The new planet lies in an eccentric orbit, so that it oscillates in and out of its star’s habitable zone. This discovery is the fruit of 20 years of observations using the best telescopes in the world. The results are published in the journal Astronomy & Astrophysics.
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