2649 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 demonstrates that non-minimally coupled bumblebee models on an FLRW background are generally pathological due to the presence of ghost modes and non-propagating scalar perturbations, unless specific degeneracy conditions are met to reduce them to a subset of generalized Proca theory, while also imposing a stringent constraint on the bumblebee field derived from the speed of tensor modes.
This paper extends the proof of the Hadamard property for the Unruh state of a free scalar field on Kerr-de Sitter spacetime to any subextreme black-hole rotation by generalizing geometric analysis of the trapped set, while also discussing its applications in numerical studies of inner horizon quantum effects and related universality results.
This paper investigates the characterization of ringdown waves in dynamical Vaidya spacetimes by extending the correspondence between quasinormal frequencies and unstable null geodesics (via the Penrose limit) from static black holes to time-dependent scenarios, validating the approach through comparisons with numerically calculated waveforms.
This paper establishes that the inverse-cube decay of curvature on asymptotically flat three-dimensional manifolds constitutes a sharp geometric threshold where the spatial Lichnerowicz operator develops a zero-energy singularity, thereby providing a spectral mechanism for the infrared structure, soft modes, and universal late-time tails of linearized gravity.
This paper presents a deep convolutional autoencoder-based anomaly detection pipeline for the Einstein Telescope that effectively identifies short-duration gravitational wave signals, such as intermediate-mass black hole mergers, from background noise with high efficiency and low false-alarm rates, offering a powerful model-independent framework for future automated searches.
This paper establishes a computational framework for spinless gravitational wave scattering in worldline quantum field theory, proving that the -matrix exponentiates to match black hole perturbation theory phase shifts up to while providing efficient diagram generation and integral calculation techniques for future high-precision analyses.
This paper proposes a new guiding principle for modified-gravity effective field theories—that closed timelike curves should be harder to obtain than in General Relativity—and demonstrates how this causal constraint, alongside stability requirements, yields unique parameter bounds on Horndeski-based rotating black holes while offering a novel gravitational-wave probe via quasinormal modes and echoes to diagnose spacetime causality.
This paper presents a blinded mock data challenge demonstrating that three distinct public pipelines can efficiently and consistently process simulated third-generation gravitational wave data to constrain cosmological parameters, achieving a 2.4% precision on the Hubble constant at and validating a robust framework for spectral siren cosmology in the Einstein Telescope era.
This paper presents the development and validation of GR-Athena++, a general-relativistic radiation magnetohydrodynamics code featuring a moment-based neutrino transport scheme and novel horizon excision techniques, which is successfully applied to simulate the complex dynamics of binary neutron star mergers and the subsequent formation of long-lived remnants or black holes.
This study employs a Bayesian approach to generate hybrid star equations of state combining hadronic and quark matter models, demonstrating that vector and multiquark interactions are essential for supporting massive neutron stars consistent with NICER and pQCD constraints while predicting a positive trace anomaly in their cores.