⚛️ Category

gr-qc

3784 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

Emergent vacua and stability constraints on black hole solutions in higher-dimensional f(R)f(R) gravity

This paper investigates static spherically symmetric vacuum solutions in higher-dimensional f(R)f(R) gravity, demonstrating that while single-term curvature corrections require a strict bound (n>D/2n > D/2) to yield stable emergent vacua without a bare cosmological constant, extending the action to a multi-term polynomial hierarchy (e.g., up to O(R3)\mathcal{O}(R^3)) circumvents this limitation and enables the dynamical generation of globally stable, ghost-free spacetimes in dimensions D≥5D \ge 5.

Nicolás Trullols Sandino, Andrei Galiautdinov2026-08-28
⚛️ high-energy theory

Euler-Heisenberg actions for gauge-axial background vectors: Hessian diagonalization, sector classification, and applications

This paper derives closed-form one-loop Euler-Heisenberg effective actions for Dirac fermions in combined electromagnetic and massive axial vector backgrounds by diagonalizing the functional Hessian to classify stability sectors, revealing novel nonperturbative pair-production rates with vacuum stabilization, dynamical chiral symmetry breaking, and potential applications ranging from baryogenesis to condensed matter physics.

Lucas Pereira de Souza2026-08-27
⚛️ general relativity

Unveiling the spectral morphological division of fast radio bursts with CHIME/FRB Catalog 2

Using unsupervised machine learning on the CHIME/FRB Catalog 2, this study reveals that fast radio bursts naturally divide into two spectral morphology-based clusters, suggesting that the observed differences between repeating and nonrepeating sources arise from selection effects rather than distinct physical populations.

Wan-Peng Sun, Yin-Long Cao, Yong-Kun Zhang, Ji-Guo Zhang, Xiaohui Liu, Yichao Li, Fu-Wen Zhang, Wan-Ting Hou, Jing-Fei Z (…)2026-08-27
⚛️ general relativity

Energetic Ceilings and Benchmarks of Astrophysical Gravitational-Wave Backgrounds

This paper establishes theoretical benchmarks and upper limits for the astrophysical gravitational-wave background from six distinct source populations, demonstrating that the observed nanoHertz signal is consistent with current supermassive black hole mass censuses while providing a framework to constrain source properties and the total gravitational-wave energy budget.

Chiara M. F. Mingarelli2026-08-27
🔭 astrophysics

Enhancing dark siren cosmology via Gaussian process reconstruction of incomplete galaxy catalogs

This paper proposes a novel framework that utilizes Gaussian process reconstruction to model line-of-sight galaxy redshift distributions in incomplete catalogs, thereby significantly improving the precision of Hubble constant constraints from dark siren cosmology compared to standard homogeneous completion methods.

Matteo Tagliazucchi, Jonathan Gair, Riccardo Barbieri, Michele Moresco2026-08-27
⚛️ general relativity

Anti-Ultralocality and Plateau Models of Inflation

This paper demonstrates that plateau-shaped inflaton potentials, often favored for their low tensor-to-scalar ratios, are particularly susceptible to anti-ultralocality effects which, starting from generic initial conditions, either prevent sufficient inflation or trigger quantum runaway, thereby imposing increasingly severe fine-tuning requirements as the inflation energy scale decreases.

Joshua Shterenberg, David Garfinkle, Anna I. Rosenzweig, David Shlivko, Paul J. Steinhardt2026-08-27
⚛️ general relativity

Exact Integrable Λ\LambdaCDM-Mimicking f(Q)f(Q) Cosmology: Background, Stability, and Perturbations in the First Connection Branch

This paper demonstrates that the first connection branch of f(Q)f(Q) gravity admits an exactly integrable Λ\LambdaCDM-mimicking cosmology by employing cosmographic closure and auxiliary-variable methods to derive closed-form analytical solutions for both background and linear perturbation dynamics, while confirming the structural stability of these solutions and comparing them with f(R)f(R) gravity.

Wompherdeiki Khyllep, Daniele Gregoris, Saikat Chakraborty, Jibitesh Dutta2026-08-27
⚛️ general relativity

Laplace surface of eccentric orbits around Kerr black hole and black-hole effects on Lidov-Kozai cycles

This paper investigates the equilibrium Laplace surfaces and Lidov-Kozai cycle dynamics of eccentric orbits around a Kerr black hole with a companion star, revealing that stability is restricted to specific inclinations and that the interplay between relativistic and tidal precessions creates a non-monotonic frequency minimum that explains the nearly isotropic orientation of the Galactic center's S-cluster.

Haonan Quan, Xing Wei2026-08-27
⚛️ general relativity

A 3D Summation-by-Parts scheme on a Hyperboloidal Foliation of Minkowski

This paper presents a stable, fully 3D Summation-by-Parts scheme for linear wave equations on hyperboloidal foliations of Minkowski spacetime. It effectively addresses the coordinate singularities associated with curvilinear coordinates and infinity through compactification. Additionally, it generalizes the definition of Kreiss-Oliger dissipation to curvilinear coordinates on general spatial manifolds, demonstrating promising results for future applications to nonlinear systems, such as the Einstein Field Equations.

Shalabh Gautam2026-08-27✓ Author reviewed ⓘ