⚛️ Category

gr-qc

2558 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.

Modeling an internal structure of a black hole using a thermodynamic quasi-particle model

This paper proposes an effective thermodynamic model for a black hole's interior composed of scalar quasiparticles, distinguishing between a dense core governed by a potential-energy functional and an inverse-temperature-like parameter, and a surrounding crust with finite kinetic temperature, to provide a unified framework for exploring singularity resolution and the thermodynamic origins of negative pressure and energy density.

Sergey Bondarenko, Dima Cheskis, Raghvendra Singh2026-04-30⚛️ gr-qc

Weakly turbulent saturation of the nonlinear scalar ergoregion instability

This paper demonstrates through time-domain simulations that the nonlinear scalar ergoregion instability on horizonless spinning ultracompact spacetimes saturates via a weakly turbulent direct cascade, which rapidly transfers energy to small scales and populates the stable light ring with higher-order modes, suggesting similar turbulent mechanisms will shape gravitational wave signatures in fully gravitational scenarios.

Nils Siemonsen2026-04-30⚛️ gr-qc

Infrared Universality: The r−3r^{-3} Spectral Threshold for Coupled Gravitational and Electromagnetic Fields

This work establishes the r−3r^{-3} curvature decay rate as a universal geometric threshold for the coupled Einstein–Maxwell system and demonstrates that decay rates faster than this value lead to compact perturbations, whereas a decay rate exactly at r−3r^{-3} triggers delocalization of the essential spectrum as well as the emergence of gravitational and electromagnetic memory.

Michael Wilson2026-04-30🔢 math-ph

First-order general constitutive equations for relativistic fluids using the projection method in the Chapman-Enskog expansion of the Boltzmann equation

This paper generalizes the first-order out-of-equilibrium correction to the relativistic Boltzmann distribution function using the projection method and Chapman-Enskog expansion to derive constitutive equations that explicitly incorporate frame and representation freedom, thereby coupling dissipative fluxes to all state variable derivatives and weak external electromagnetic fields.

A. L. García-Perciante, A. R. Méndez, O. Sarbach2026-04-30⚛️ gr-qc

Mind the peak: improving cosmological constraints from GWTC-4.0 spectral sirens using semiparametric mass models

By applying a novel semiparametric B-spline model to 137 binary black hole events from GWTC-4.0, this study resolves three distinct mass distribution peaks and achieves a 12–21% improvement in the precision of the Hubble constant (H0H_0) compared to standard parametric models, demonstrating that capturing the full complexity of the mass distribution is essential for maximizing the cosmological potential of gravitational wave spectral sirens.

Matteo Tagliazucchi, Michele Moresco, Nicola Borghi, Chiara Ciapetti2026-04-30⚛️ gr-qc