Tag

Quantum Gravity

All articles tagged with #quantum gravity

science19 days ago•14 min saved

Bootstrapping String Theory: New Results Refresh the Debate

The article surveys string theory’s status: critics call it untestable amid a vast landscape of possible configurations, but recent bootstrapping work shows the Veneziano amplitude can emerge as a unique outcome under certain high-energy assumptions, reviving the question of whether string theory is the sole correct description of quantum gravity. While mathematically intriguing, these results are debated and lack experimental confirmation, leaving the theory’s ultimate status unresolved.

via Quanta Magazine|

#bootstrapping #quantum-gravity #science

science1 month ago•15 min saved

Fractal Space-Time: A Scale-Symmetric Path to Predictive Quantum Gravity

Physicist Astrid Eichhorn explains that gravity may be made predictive at all scales via asymptotic safety—a scale-symmetric, fractal-like space-time that reaches a fixed point around the Planck scale, linking microscopic physics to particle properties, constraining some dark-matter candidates, and potentially coexisting with other quantum-gravity approaches—while remaining testable through experiments.

via Quanta Magazine|

#asymptotic-safety #fixed-point #fractal-space-time

science1 month ago•8 min saved

Quantum Spacetime Alters Particle Paths, Rewriting Geodesics

Vienna University of Technology researchers quantized the spacetime metric to derive the q-desic equation, showing that in a quantum spacetime particles need not follow classical geodesics; while deviations from ordinary gravity are vanishingly small, including the cosmological constant can produce noticeable differences at cosmological scales, potentially offering an observational path to test quantum gravity.

via ScienceDaily|

#geodesics #observations #quantum-gravity

science1 month ago•4 min saved

Graviton single-minus amplitudes emerge in special kinematics

A new preprint extends previous gluon results to gravitons, showing that single-minus graviton tree amplitudes do not vanish in the half-collinear regime and can be described by explicit formulas derived from symmetry and recursion. This connects gravity amplitudes to Penrose’s w-(1+∞) symmetry and highlights AI-assisted reasoning (via GPT-5.2 Pro) in discovering these results, marking progress in linking quantum mechanics with general relativity and suggesting further extensions.

via OpenAI|

#gravitons #penrose-symmetry #quantum-gravity

science1 month ago•10 min saved

Q-Desic: A Quantum Twist on Spacetime Opens Doors to Quantum Gravity Tests

Vienna University of Technology researchers derive a q-desic equation by quantizing the spacetime metric in a simple gravitational field, predicting that quantum spacetime can subtly alter particle trajectories. The deviations are minuscule on small scales, but when the cosmological constant is included they become significant at cosmological distances, potentially offering an observable to test and distinguish quantum gravity theories using astronomical data.

via SciTechDaily|

#cosmology #geodesics #quantum-gravity

science1 month ago•6 min saved

Time as the Bridge: Reimagining Einstein–Rosen Wormholes as Two-Way Temporal Links

New research argues Einstein–Rosen bridges are not spatial shortcuts but two-directional structures in time, acting as complementary halves of a quantum state with forward and backward arrows of time. This framework preserves information across horizons, offering a natural resolution to the black hole information paradox without new physics and suggesting the Big Bang could be a quantum bounce between time-reversed phases. While it does not imply traversable wormholes, the idea points to a deeper quantum gravity picture and potential observational hints such as remnants in the cosmic microwave background or relic black holes.

via SciTechDaily|

#black-holes #cosmology #quantum-gravity

science1 month ago•2 min saved

Crystal-Clear Gravitational Wave Confirms Einstein’s General Relativity

A record-high-quality gravitational wave signal from a binary black hole merger (GW250114) produced multiple ringdown tones that independently yield the same black-hole mass and spin, providing a precise test of general relativity that passes, while underscoring the ongoing pursuit of quantum gravity and related gaps in our understanding.

via Universe Today|

#black-holes #general-relativity #gravitational-waves

science2 months ago•37 min saved

Entropy Could Be Gravity’s Hidden Origin, Pointing Toward Quantum Gravity

A new theory by physicist Ginestra Bianconi suggests gravity may emerge from entropy, potentially reconciling Einstein’s general relativity with quantum theory. By treating spacetime as a quantum operator and describing an entropic action that couples matter to geometry through a G-field, the framework aims to yield a small cosmological constant and offer a candidate explanation for dark matter. While intriguing, the idea remains speculative and requires substantial further work to confirm its viability as a unified theory of physics.

via Yahoo News Canada|

#dark-matter #entropy #gravity

space2 months ago•14 min saved

Einstein–Rosen Bridges: Time Mirrors, Not Tunnels

A new study reframes the Einstein–Rosen bridge from a travel conduit to a time-symmetric link that preserves unitarity in curved spacetime, suggesting wormholes aren’t cosmic tunnels, potentially resolves the black hole information paradox, and portrays the Big Bang as a quantum bounce between opposing arrows of time with possible connections to dark matter.

via Interesting Engineering|

#big-bang #black-holes #einstein-rosen-bridge

science2 months ago•8 min saved

Gamma-Ray Tests Tighten Lorentz-Invariance Bounds, Not Break Special Relativity

New analysis of gamma-ray flares from pulsars, active galactic nuclei, and gamma-ray bursts finds no energy-dependent speed of light, placing stricter bounds on Lorentz-violating effects predicted by some quantum gravity theories. The results tighten the allowed violations by about 1.5 orders of magnitude and offer a framework for integrating new data into the SME; in short, SR remains consistent, while the search for quantum-gravity signatures continues.

via Hackaday|

#gamma-rays #lorentz-invariance #quantum-gravity

science2 months ago•5 min saved

Two Arrows of Time: A Quantum Bridge Reframes Wormholes as Temporal Links

Researchers reinterpret Einstein–Rosen bridges as two complementary time directions in quantum gravity, not spatial tunnels; information can flow across horizons along a mirror time, potentially solving the black hole information paradox. The framework also envisions a cosmological bounce, with our universe possibly inside a black hole from another cosmos, eliminating the need for traversable wormholes or faster‑than‑light travel.

via The Conversation|

#black-holes #cosmology #quantum-gravity

science3 months ago•3 min saved

Scientists Challenge Einstein's Speed Limit

Scientists tested the possibility of breaking Einstein's speed of light rule by examining high-energy gamma rays from distant cosmic sources. Their findings confirmed Einstein's predictions, setting tighter limits on potential violations of Lorentz invariance and advancing our understanding of fundamental physics, though the quest to unify quantum theory and gravity continues.

via ScienceDaily|

#astrophysics #einstein #lorentz-invariance

science3 months ago•4 min saved

Scientists Propose Experiments to Explore Quantum and Gravitational Wave Interactions

Physicist Ralf Schützhold proposes an experiment to manipulate gravitational waves using light, potentially enabling the transfer of energy between light and gravitational waves and providing insights into the quantum nature of gravity, building on the principles of interferometry similar to LIGO.

via SciTechDaily|

#gravitational-waves #gravitons #interferometer

science5 months ago•6 min saved

New Study Clarifies Classical Gravity's Role in Quantum Entanglement

Recent research by Aziz and Howl suggests that matter can become quantum entangled through gravitational fields even if gravity is not quantum, challenging traditional views on quantum gravity and proposing new ways to test its existence in future experiments.

via Space|

#entanglement #feynman-thought-experiment #general-relativity

science5 months ago•5 min saved

Are Singularities Necessary in Black Holes?

Some theories suggest black holes might not have singularities or even event horizons, with models like the Hayward metric proposing non-singular, horizonless black holes that align with current observations, challenging traditional views based on general relativity and quantum physics.

via Phys.org|

#black-holes #event-horizon #hayward-metric