3841 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 establishes model-independent lower and upper bounds on the shadow radius of static, spherically symmetric, asymptotically flat black holes in -dimensional Einstein gravity supported by anisotropic matter, proving that these bounds are saturated by the vacuum Schwarzschild-Tangherlini solution and generalize known four-dimensional results.
This paper demonstrates that while the Hod function representation of the hoop conjecture protects a specific class of generalized regular black holes from violation, it simultaneously reveals factors that challenge their validity as black holes and establishes that the Hod mass is the matter counterpart of the Misner-Sharp quasilocal mass, thereby grounding all such conclusions strictly within general relativity.
This paper investigates the Novikov-Thorne thin accretion disk profiles of a Bogush-Gal'tsov spinning naked singularity and finds that, unlike a Kerr black hole, it exhibits a conversion efficiency independent of scalar charge and significantly enhanced emissivity flux—potentially up to times larger—which may serve as a distinctive observational hallmark for naked singularities.
This paper establishes a UV-finite Ryu-Takayanagi relation in AdS/CFT by utilizing relative entropy instead of divergent von Neumann entropy, demonstrating that the variation of the boundary relative entropy between a vacuum and a coherent state equals the variation of the bulk geodesic length divided by to linear order.
This paper demonstrates that analytical Hubble-flow parametrisations of ultra-slow-roll inflation often conceal sharp, unphysical UV features in the underlying scalar potential, which can be systematically removed via Fourier filtering to reveal that such models typically respect Wands duality and questioning the robustness of these simple parametrisations for modeling transient non-attractor phases.
This paper constructs fully dynamic, direction-dependent sensitivity curves for space-based gravitational-wave detectors LISA and Taiji by incorporating their orbital motion and unequal-arm configurations, revealing that the static approximation significantly underestimates low-frequency sensitivity variations and source detectability, thereby necessitating dynamic models for accurate scientific predictions.
Using numerical simulations across various dark energy cosmologies, this study reveals that the perpendicular alignment strength between void-surface galactic halos and void centers is significantly enhanced by dark energy with more negative and rapidly evolving pressure, establishing this alignment as a powerful independent indicator of dark energy's dynamic nature.
This paper presents a generalized formulation based on multiple geometric time-delay interferometry links that streamlines the derivation of response functions for 45 second-generation space-borne gravitational wave detector combinations, thereby reducing computational complexity and enhancing physical clarity for future data processing.
This paper introduces HIcosmo, an open-source, JAX-based framework for efficient cosmological inference that leverages automatic differentiation and GPU acceleration to achieve significantly faster sampling speeds than existing tools like Cobaya while supporting a wide range of Stage IV survey likelihoods and cosmological models.
This paper computes the classical gravitational Compton amplitude at the fourth post-Minkowskian order () using the Worldline Quantum Field Theory framework, derives the corresponding -matrix element for gravitational-wave scattering phase shifts, and validates the results against black-hole perturbation theory.