3839 papers
Quantum gravity represents the frontier where the very large meets the very small, attempting to unify Einstein's theory of gravity with the strange rules of quantum mechanics. This field explores the fundamental fabric of spacetime, seeking to understand how the universe behaves at its most extreme scales, from the heart of black holes to the moment of the Big Bang. Because these concepts often involve complex mathematics, they can feel distant to non-specialists, yet they hold the key to a complete picture of physical reality.
At Gist.Science, we bridge this gap by processing every new preprint in this category directly from arXiv. Our team provides both plain-language explanations and detailed technical summaries for each paper, ensuring that groundbreaking research is accessible to everyone, from curious students to seasoned researchers. Below are the latest papers in quantum gravity, offering fresh insights into the nature of our cosmos.
This paper argues that while certain forms of epistemic opacity in machine learning and simulations can be epistemically acceptable within the broader framework of black hole imaging, the current opacity of GRMHD models for Sagittarius A* reveals fundamental limitations in our understanding of the source and constrains the future application of machine learning methods.
This paper constructs a perturbative scalar-tensor solution describing a central inhomogeneity embedded in an evolving bouncing cosmological background, demonstrating that a small evolving horizon persists through the nonsingular bounce, thereby supporting the interpretation of a black hole surviving the cosmological transition.
This study uses numerical simulations to analyze BHNS mergers with masses consistent with GW230529, revealing that even below the predicted tidal disruption limit, low-mass accretion disks can form to power compact-binary gamma-ray bursts, while also highlighting discrepancies between current remnant mass models and simulation results for certain equations of state.
This paper develops a model-independent response formalism incorporating first-order orbital dynamics to generate comprehensive sky maps and detection strategies for distinguishing the unique scalar breathing mode predicted by Gravitational Quantum Field Theory from standard tensor modes using future space-based interferometers like LISA and Taiji.
This paper identifies a new class of time-periodic attractor solutions called Cosmological Frequency Combs in exponential quintessence models with phantom matter, which induce coherent oscillations in cosmological observables and offer a dynamical mechanism to resolve the Hubble tension.
This paper investigates GW230814, the loudest single-detector gravitational-wave signal in the GWTC-4.0 catalog, confirming its binary black hole origin and the first detection of an mode while finding that minor ringdown deviations are consistent with noise rather than a breakdown of general relativity, ultimately highlighting that single-observatory detections, despite their high significance, severely limit rigorous fundamental physics conclusions without multi-detector corroboration.
This paper introduces a tangent bundle formalism using covariant differential forms to derive an exact, all-orders in-in Lagrangian and equations for finite geodesic deviation, providing explicit expressions up to the tenth order that confirm previous fourth-order results.
This paper proposes a model of holographic dark matter derived from the infrared horizon cutoff, which accounts for dark matter density, explains the coincidence between baryonic and nonbaryonic contributions, and reverses the sign of pre-existing vacuum energy to align negative theoretical predictions with positive observational values.
This paper provides comprehensive support material for the May 2025 Galileo Galilei Institute school, offering a pedagogical introduction to asymptotic symmetries and flat holography that covers foundational formalisms like the covariant phase space and Noether theorem, while presenting original derivations of the BMS group using Minkowski space and integral Hamiltonian generators for scalar fields on null hypersurfaces.
This paper investigates the viability of non-Hermitian quantum mechanics in cosmology by extending the Wheeler-DeWitt framework and finding that observational constraints from inflation, structure growth, and cosmic flatness strongly suppress non-Hermitian effects, suggesting that Hermiticity may emerge dynamically in our universe.