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Quantum Gravity

All articles tagged with #quantum gravity

The Holographic Principle: How Gravity Might Reduce 3D Reality to 2D Data
science14 days ago

The Holographic Principle: How Gravity Might Reduce 3D Reality to 2D Data

The holographic principle suggests that all information within a volume of space can be encoded on its boundary surface. While initially derived from black hole entropy calculations by Jacob Bekenstein and Stephen Hawking, the concept was solidified by the AdS/CFT correspondence in the late 1990s. This mathematical equivalence between gravity in a curved space and quantum mechanics on its boundary implies that our three-dimensional reality might be an emergent projection of lower-dimensional quantum data, challenging traditional views of space and time.

via Quanta Magazine|
#adscft-correspondence#black-hole-entropy#holographic-principle
CERN’s CMS and ATLAS experiments tighten limits on microscopic black holes
science15 days ago

CERN’s CMS and ATLAS experiments tighten limits on microscopic black holes

CERN’s CMS and ATLAS experiments have found no evidence of microscopic black holes in recent proton collisions, but they have significantly narrowed the energy range where such objects could exist. Using 138 inverse femtobarns of data from 2016-2018, CMS excluded semiclassical black holes below 9.0 to 11.4 TeV, while ATLAS’s 2022-2024 data excluded models up to 9.4 TeV. These null results, achieved through new machine learning techniques, constrain theories involving extra dimensions and help resolve the hierarchy problem by eliminating viable parameter spaces for quantum gravity.

via The Brighter Side of News|
#cern#large-hadron-collider#machine-learning
LHC keeps chasing tiny quantum black holes to unlock quantum gravity
science18 days ago

LHC keeps chasing tiny quantum black holes to unlock quantum gravity

Physicists using the CMS detector at the LHC have hunted for ultra‑small, short‑lived quantum black holes that could bridge quantum mechanics and general relativity. While such objects might arise from collisions at extreme energies and potentially reveal hidden dimensions, the CMS analysis up to about 12 TeV found no evidence, setting exclusion limits and refining where new physics could hide. The null result advances the search for a quantum gravity framework and a theory of everything, with higher energies and more data expected to continue the hunt carefully rather than posing any danger to Earth.

via Space|
#extra-dimensions#large-hadron-collider#quantum-black-holes
Rovelli questions analytic realism, urging a science–philosophy dialogue
philosophy24 days ago

Rovelli questions analytic realism, urging a science–philosophy dialogue

Physicist Carlo Rovelli argues in an interview that analytic philosophy’s naive realism oversimplifies the issue of what’s real, contending that questions about the reality of electrons or minds are not well-posed and that neither science nor philosophy can access ultimate reality. He promotes ongoing dialogue between science and philosophy, drawing on ideas from quantum gravity and his book On the Equality of All Things.

via IAI TV|
#analytic-philosophy#philosophy#quantum-gravity
Physicists Split on Universe’s Biggest Questions, Survey Finds
science26 days ago

Physicists Split on Universe’s Biggest Questions, Survey Finds

The largest global survey of physicists reveals little consensus on core questions—from dark matter and black holes to unifying gravity with quantum mechanics and the standard ΛCDM model— with only two items reaching majority support: the Big Bang’s interpretation and cosmic inflation. Views on dark matter, gravity, and cosmology are highly divided, and DESI’s hint that dark energy may vary challenges the standard model. The authors frame this disagreement as opportunity for new data and theory, and an online dashboard lets readers explore the results.

via Science Daily|
#cosmology#dark-matter#physics
Photon’s TikTok Through Einstein’s Rules: Axions and Tiny Lorentz Violations May Explain a 300 TeV Travel</title>
physics-and-chemistry1 month ago

Photon’s TikTok Through Einstein’s Rules: Axions and Tiny Lorentz Violations May Explain a 300 TeV Travel</title>

Physicists propose GRB 221009A’s extreme 300 TeV photons survived a two‑billion‑light‑year trip by briefly converting into axion‑like particles, with a tiny Lorentz‑invariance violation enabling a “fast lane.” A predicted one‑hour gap between lower‑energy photons and the 300 TeV burst matched an independent Chinese observation, offering empirical support and a potential probe of quantum gravity.

via Gizmodo|
#axion-like-particles#gamma-rays#grb-221009a
BOAT photon hints at new physics beyond Einstein via axions and possible Lorentz-violation
science1 month ago

BOAT photon hints at new physics beyond Einstein via axions and possible Lorentz-violation

A high-energy photon from GRB 221009A, nicknamed the BOAT, arrived on Earth despite expectations it would be absorbed by the cosmic microwave background. Researchers propose it may have traveled as an axion-like particle and later converted back, potentially aided by a high-energy Lorentz-invariance violation, effectively giving photons a “fast lane” through space. The arrival timing aligns with the theory, and if confirmed, could turn space into a natural laboratory for quantum gravity research.

via space.com|
#axion-like-particles#cosmic-microwave-background#gamma-ray-burst
Gravity Goes Quantum: First Quantum-Scale Test Nudges Toward Unifying Physics
science1 month ago

Gravity Goes Quantum: First Quantum-Scale Test Nudges Toward Unifying Physics

Scientists used the Quantum Galileo Interferometer to split a cloud of rubidium atoms into two paths—one falling under gravity and the other held in place—then recombined the waves to measure gravity’s effect on a quantum phase. The observed interference shows Einstein’s equivalence principle holds at the quantum scale and represents the first quantum‑scale hint of how gravity and quantum mechanics might be unified, though it is not a full quantum gravity demonstration; the work appeared in Science Advances.

via Space|
#atom-interferometry#equivalence-principle#general-relativity
Cosmic Acceleration May Be a Signature of Quantum Gravity on the Horizon
science1 month ago

Cosmic Acceleration May Be a Signature of Quantum Gravity on the Horizon

Physicist Savvas Koushiappas suggests the Universe’s accelerating expansion could arise from a quantum modification to cosmic geometry at the cosmological horizon, meaning dark energy might be replaced by a macroscopic imprint of quantum gravity. By tying the uncertainty in simultaneously knowing the Universe’s size and expansion rate to altered expansion equations, the model could explain acceleration and even allow a bouncing origin instead of a Big Bang, though it leaves several questions unresolved. Future data from DESI, Euclid, and the Vera Rubin Observatory could test these ideas and refine our understanding of cosmic expansion.

via Yahoo|
#cosmological-horizon#cosmology#dark-energy
Cosmic Acceleration Could Be a Quantum Gravity Imprint, Not Dark Energy
science1 month ago

Cosmic Acceleration Could Be a Quantum Gravity Imprint, Not Dark Energy

A new Physical Review D paper by Savvas Koushiappas suggests the Universe’s accelerating expansion may arise from a macroscopic quantum uncertainty in simultaneously knowing the Universe’s size and expansion rate, effectively tying cosmic acceleration to quantum gravity at the cosmological horizon rather than to dark energy. The model can modify the expansion history and even allow a Big Bang replacement by a bounce in some configurations. Observations from DESI, Euclid, and the Vera C. Rubin Observatory could test these ideas, but the proposal remains speculative with open questions about consistency and interpretation.

via ScienceAlert|
#cosmological-horizon#cosmology#dark-energy
Black Hole Singularity Might Be a 3D Surface, Not a Point
science2 months ago

Black Hole Singularity Might Be a 3D Surface, Not a Point

A forthcoming Physical Review D paper argues that Schwarzschild (and likely Kerr) singularities are better described as flat, three-dimensional spacelike surfaces rather than points. This means two observers falling in from opposite directions cannot converge on the same spacetime event, a result that could reshape how general relativity breaks down inside black holes and redefine the starting point for quantum gravity research.

via ScienceAlert|
#black-hole#general-relativity#quantum-gravity
Gravity Emerges from Entropy: A Thermodynamic View of the Cosmos
science2 months ago

Gravity Emerges from Entropy: A Thermodynamic View of the Cosmos

Physicist Ginestra Bianconi proposes Gravity from Entropy (GfE), a quantum gravity framework in which gravity arises from an information-theoretic tension between two spacetime metrics. They find total entropy increases with cosmic expansion while entropy per unit volume falls, allowing local structure to form even as the universe trends toward disorder. GfE reduces to General Relativity at low energies but includes a dynamical dark-energy term that could yield observable effects, offering a potential bridge between gravity, thermodynamics, and quantum theory.

via SciTechDaily|
#cosmology#entropy#gravity
From Planes to Spacetime: Sabrina Pasterski’s Quantum Gravity Quest
science3 months ago

From Planes to Spacetime: Sabrina Pasterski’s Quantum Gravity Quest

Sabrina Gonzalez Pasterski, a Chicago-born prodigy who built and solo-flied a plane as a teen, topped MIT physics, earned a Harvard PhD, and contributed to quantum gravity and the spin memory effect (cited by Hawking). She turned down lucrative offers from Blue Origin, Brown University, and NASA, and joined the Perimeter Institute in 2021 as the youngest faculty member, where she founded the Celestial Holography Initiative. In 2023, the Simons Foundation granted $8 million to support her collaborative work linking spacetime with quantum theory.

via The Times of India|
#celestial-holography-initiative#perimeter-institute#quantum-gravity