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 introduces a numerical polology framework that samples coupling spaces to discover perturbative, ghost-free dark sector models and validates them against observational constraints from black hole superradiance, dynamical dark energy, and gravitational waves.
This paper analyzes the evolution of a black hole population through the contraction, bounce, and expansion phases of a bouncing cosmology using a two-fluid interacting model, revealing that black holes can persist through the bounce and that their presence alters the properties of the background cosmological fluid within a fixed spacetime geometry.
Using numerical relativity in the decoupling limit of quadratic scalar Gauss-Bonnet gravity, this study demonstrates that hyperbolic encounters of black holes can induce temporary dynamical scalarization and permanent spin-induced scalarization or descalarization, even for configurations that initially lack scalar hair.
This paper develops a nonlinear iterative framework to analyze the repetitive Penrose process for charged particles in extremal Kerr-Newman black holes, revealing that attractive electromagnetic interactions can significantly enhance energy extraction efficiency and that, unlike in Reissner-Nordström spacetime, these black holes can evolve through a neutral state and reverse their charge while preserving cosmic censorship.
This paper investigates the holographic Casimir effect between parallel spherical defects, revealing a first-order phase transition to a vanishing force in the disconnected phase, providing support for the conjectured holographic lower bound for free theories, and demonstrating that cosmic censorship explains the attractive nature of the force while forbidding repulsive configurations associated with naked singularities.
This paper employs phase space deformation quantization using Weyl quantization and the Moyal star product to construct explicit Wigner distributions for Taub and Kantowski-Sachs cosmological models, thereby resolving factor ordering ambiguities and formal convergence issues while recovering standard wave functions expressed as modified Bessel functions.
This paper analyzes the four-dimensional Palatini-Cartan gravity model through various geometric-covariant formalisms, deriving its field equations, gauge symmetries, and Noether currents while employing multisymplectic, polysymplectic, and Dirac-Hamiltonian frameworks to characterize its momentum maps, constraint structures, and instantaneous Hamiltonian formulation.
This paper numerically investigates the horizon structures of Kalb-Ramond modified Lorentz-violating hairy black holes with relaxed energy conditions, identifying four distinct types including braneworld analogues, and demonstrates that while Thorne's hoop conjecture holds for most cases, it fails for Schwarzschild-de Sitter generalizations, while also highlighting how braneworld tidal charges uniquely increase planetary perihelion advance compared to ordinary black holes.
This paper investigates Galactic microlensing by backreacted massless wormholes, demonstrating that electrically charged variants produce distinct observational signatures—specifically dimmer light curves with characteristic "gutters" and vanishing Einstein radii at extreme charge limits—compared to Schwarzschild black holes, suggesting that re-examining past microlensing data could reveal their presence as dark halo objects.
This paper proposes an accelerated Unruh-DeWitt battery model to demonstrate that the maximal quantum work extraction (ergotropy) serves as a witness for trajectory-modified vacuum fluctuations, revealing distinct thermality behaviors between linear and circular motions and significant oscillations near reflecting boundaries driven by the protection of quantum coherence.