#Quantum Gravity

[spades4cards]

••´º´•𝐁𝐨𝐫𝐢𝐧𝐠 𝐌𝐚𝐬𝐭𝐞𝐫𝐥𝐢𝐬𝐭•´º´••

×｡. Physicist's List ｡.× * General Relativity * Quantum Gravity

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[frank-olivier]

Cosmic Genesis: How Black Holes Might Be Giving Birth to New Universes

The human quest for understanding the universe has led to numerous groundbreaking discoveries, each weaving a more intricate tapestry of our cosmic landscape. A recent theoretical framework, pioneered by Professor Nikodem Poplawski, proposes a revolutionary concept: every black hole creates a new, growing universe inside its event horizon. This idea, rooted in the Einstein-Cartan Theory, introduces torsion to the fabric of spacetime, avoiding gravitational singularities and transforming our understanding of black holes and the multiverse.

By incorporating torsion, the theory predicts that matter within a black hole, instead of collapsing into a singularity, reaches a “big bounce” and then expands into a new, closed universe. This challenges our current understanding of the cosmos, suggesting that our universe is a vast, cosmic nursery, giving birth to billions of “baby universes” through black holes. Each black hole, once thought to be a region of spacetime from which nothing can escape, now becomes a gateway to a new, unobservable universe, raising fundamental questions about the nature of reality and our place within the multiverse.

The introduction of torsion also has far-reaching implications for the long-standing gap between general relativity and quantum mechanics. By violating the linearity of quantum mechanics, torsion favors the pilot-wave interpretation, where particles have definite positions, guided by a wave function. This non-linear aspect of torsion could provide a crucial link in the quantum gravity puzzle, enabling a more unified understanding of the universe, from the smallest subatomic particles to the vast expanse of cosmic structures.

While experimental verification of torsion poses significant challenges, it is not insurmountable. Future astronomical observations of the early universe, utilizing gravitational waves and neutrinos, may uncover the distinctive signature of torsion in the cosmic microwave background radiation. Additionally, cutting-edge particle physics experiments could reveal the extended sizes of elementary particles, predicted by the theory, or the effects of non-commutative momentum in high-energy collisions, providing a tantalizing prospect of empirical confirmation.

The profound implications of Poplawski’s theory, if confirmed, would revolutionize our understanding of black holes, transforming them from cosmic dead ends to gateways of creation. The multiverse, once a topic of speculative debate, would gain a theoretical foundation, with our universe being just one of many, interconnected through a web of black holes. This pursuit of knowledge, even if verification takes decades or centuries, embodies the spirit of scientific inquiry, driving us to push the boundaries of human understanding and illuminating the intricate, ever-unfolding tapestry of the cosmos.

Nikodem Poplawski: The Unknown Revolutionary Theory of Black Holes (This Is World, March 2025)

Monday, March 3, 2025

[simpsforscience]

🪐 Explore the quantum dance of the four fundamental forces with Milton! 🐈‍⬛Join him as he meets the particles behind electromagnetism, gravity, and strong and weak nuclear forces. Swipe ➡ through this post to unfold their mystery. Which one is your favorite? 🤔Let us know in the comments!

📸Image credit: MARK GARLICK/SCIENCE PHOTO LIBRARY/GETTY IMAGES PLUS; ADAPTED BY L. STEENBLIK HWANG

[a-typical]

Our familiar experience of a simple deterministic reality of unambiguous objects is the illusion, a deception made possible because of our poor perception, our blurry vision, our slow reflexes, our limited strength. To achieve such a profound unification of all natural law into one, we need to grasp a quantum description of gravity, and that has proven deftly elusive.

Black Hole Survival Guide — Janna Levin

[4gravitons]

Amplitudes 2024, Continued

Completing this year's Amplitudes conference coverage

I’ve now had time to look over the rest of the slides from the Amplitudes 2024 conference, so I can say something about Thursday and Friday’s talks. Thursday was gravity-focused. Zvi Bern’s review talk was actually a review, a tour of the state of the art in using amplitudes techniques to make predictions for gravitational wave physics. Bern emphasized that future experiments will require much…

[wayti-blog]

"Scientists are a step closer to unraveling the mysterious forces of the universe after working out how to measure gravity on a microscopic level."

"(...) now physicists at the University of Southampton, working with scientists in Europe, have successfully detected a weak gravitational pull on a tiny particle using a new technique.

They claim it could pave the way to finding the elusive quantum gravity theory.

The experiment, published in Science Advances, used levitating magnets to detect gravity on microscopic particles—small enough to border on the quantum realm.

Lead author Tim Fuchs, from the University of Southampton, said the results could help experts find the missing puzzle piece in our picture of reality.

He added, "For a century, scientists have tried and failed to understand how gravity and quantum mechanics work together. Now we have successfully measured gravitational signals at a smallest mass ever recorded, it means we are one step closer to finally realizing how it works in tandem.

"From here we will start scaling the source down using this technique until we reach the quantum world on both sides. By understanding quantum gravity, we could solve some of the mysteries of our universe—like how it began, what happens inside black holes, or uniting all forces into one big theory.""

continue reading article

[joking-mr-feynman]

i love physicists

[pinkmoon-fox]

"the problem with the quantum gravity theory? we dont have one."

- my astrophysics prof last week

[averycanadianfilm]

The traditional view from particle physics is that quantum gravity effects should only become detectable at extremely high energies and small length scales. Due to the significant technological challenges involved, there has been limited progress in identifying experimentally detectable effects that can be accessed in the foreseeable future. However, in recent decades, the size and mass of quantum systems that can be controlled in the laboratory have reached unprecedented scales, enabled by advances in ground-state cooling and quantum-control techniques. Preparations of massive systems in quantum states pave the way for the explorations of a low-energy regime in which gravity can be both sourced and probed by quantum systems. Such approaches constitute an increasingly viable alternative to accelerator-based, laser-interferometric, torsion-balance, and cosmological tests of gravity. In this review, we provide an overview of proposals where massive quantum systems act as interfaces between quantum mechanics and gravity. We discuss conceptual difficulties in the theoretical description of quantum systems in the presence of gravity, review tools for modeling massive quantum systems in the laboratory, and provide an overview of the current state-of-the-art experimental landscape. Proposals covered in this review include, among others, precision tests of gravity, tests of gravitationally-induced wavefunction collapse and decoherence, as well as gravitymediated entanglement. We conclude the review with an outlook and summary of the key questions raised.

Sougato Bose, Ivette Fuentes, Andrew A. Geraci, Saba Mehsar Khan, Sofia Qvarfort, Markus Rademacher, Muddassar Rashid, Marko Toroš, Hendrik Ulbricht, Clara C. Wanjura

[stemwithjoricanka]

[frank-olivier]

AdS/CFT Correspondence: A New Paradigm in Understanding Quantum Gravity

The AdS/CFT correspondence is a theoretical concept suggesting a deep connection between two different types of physical theories:

Anti-de Sitter Space (AdS), a kind of space used in theories of gravity, a universe where the geometry is curved in a specific way (negatively curved). It has more dimensions than our usual three-dimensional space.

Conformal Field Theory (CFT), a type of quantum field theory that obeys certain symmetry rules. These theories are defined on flat spaces with one less dimension than the AdS space.

The correspondence proposes that these two theories are "dual" to each other, meaning they describe the same physics in different languages:

as a Gravitational Theory in AdS Space, a theory that includes gravity, like a version of Einstein's general relativity, but in a universe with extra dimensions.

and a Quantum Field Theory on the Boundary, a theory without gravity, living on the boundary (or edge) of the AdS space. It has one less dimension than the AdS space.

The idea is similar to a hologram, where a three-dimensional image can be encoded on a two-dimensional surface. Here, the complex physics inside the AdS space can be fully described by the simpler CFT on its boundary. and a Quantum Field Theory on the Boundary, a theory without gravity, living on the boundary (or edge) of the AdS space. It has one less dimension than the AdS space.

The correspondence offers insights into quantum gravity, which seeks to unify general relativity (gravity) with quantum mechanics. It allows physicists to study aspects of quantum gravity using well-understood quantum field theories and it provides tools for understanding black hole physics, including how information might be preserved when black holes evaporate—a major question in theoretical physics. Beyond high-energy physics, the correspondence has applications in condensed matter physics and other fields, helping model complex systems that are difficult to study otherwise.

While powerful, the AdS/CFT correspondence is still theoretical and best understood in highly symmetric cases. Extending it to more realistic scenarios, like our universe with positive curvature (de Sitter space), remains challenging. The AdS/CFT correspondence suggests that gravitational theories and quantum field theories are two sides of the same coin, providing a new way to explore fundamental questions in physics.

Juan Maldacena, an Argentine physicist, proposed the AdS/CFT correspondence in 1997. Maldacena's work, particularly his paper on this topic, is one of the most highly cited in physics, highlighting its significance in string theory and its potential to unify quantum mechanics with general relativity.

Juan Maldacena: AdS/CFT Correspondence, Part 1 (Institute for Advanced Study, July 2010)

Juan Maldacena: AdS/CFT Correspondence, Part 2 (Institute for Advanced Study, July 2010)

Juan Maldacena: AdS/CFT Correspondence, Part 3 (Institute for Advanced Study, July 2010)

Monday, September 23, 2024

[simpsforscience]

⁉️ What if you're told to forget smooth spacetime and imagine the universe as a cosmic quilt made up of loops? 💭 ➰ That's Loop Quantum Theory! which proposes that space itself is made of tiny, 🤏🏻 interconnected loops, ➿ a fabric of reality finer than any thread. Swipe ➡️ through this post to find how it is a potential quantum upgrade to Einstein's gravity, where the universe isn't just curved, it's knotted!🪢☄️🌠

📸 Image Credits:

Abhay Astekar :- PennState Eberly College of Science

Carlo Rovelli :- Foto LaPresse

Lee Smolin :- footnotes2plato

[xenonreality]

How I had a simple idea that led to more confirmation of my idea about how quantum gravity comes about as a result of watching Angela Collier's video called "a brief physics distraction" & my reaction

[4gravitons]

Why Quantum Gravity Is Controversial

Why quantum gravity is hard is one thing. Why it's controversial is something else:

Merging quantum mechanics and gravity is a famously hard physics problem. Explaining why merging quantum mechanics and gravity is hard is, in turn, a very hard science communication problem. The more popular descriptions tend to lead to misunderstandings, and I’ve posted many times over the years to chip away at those misunderstandings. Merging quantum mechanics and gravity is hard…but despite…

[a-typical]

There's an aspiration to uncover a single unified theory of everything, the ultimate physical law that unites all into one. The campaign to reveal a theory of everything is motivated by the compelling suggestion that gravity and the matter forces, despite convincing appearances, are actually different expressions of the same underlying phenomenon.

Black Hole Survival Guide — Janna Levin