⚛️ Category

gr-qc

3919 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.

⚛️ general relativity

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
🔢 mathematics

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
⚛️ general relativity

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
⚛️ general relativity

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
⚛️ general relativity

Strong-field signatures of a regular black hole in an Einasto dark matter halo

This paper investigates the strong-field signatures of a regular black hole embedded in an Einasto dark matter halo, revealing that while timelike orbital observables remain largely degenerate with the Schwarzschild limit, the photon sphere, shadow diameter, and optical appearance near the critical halo parameter provide the most sensitive probes for distinguishing this model from standard black holes, with current EHT observations of Sgr A* and M87* constraining the halo parameter to specific ranges.

Mohsen Fathi, Faizuddin Ahmed2026-04-30
⚛️ high-energy theory

H\mathcal{H}olographic N\mathcal{N}aturalness and Pre-Geometric Gravity

This paper proposes a unified resolution to the cosmological constant problem by integrating holographic naturalness and pre-geometric gravity, arguing that the stability of the de Sitter vacuum arises from an entropic barrier linked to a pre-geometric Higgs field that dynamically generates both spacetime geometry and the observed smallness of dark energy.

Andrea Addazi, Salvatore Capozziello, Giuseppe Meluccio2026-04-30