⚛️ Category

gr-qc

3884 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

The Role of Gravitational Energy Flux in Cosmic Acceleration

Motivated by the observed accelerated expansion of the universe, this paper investigates whether gravitational radiation energy and its flux, treated as well-defined physical quantities within the teleparallel equivalent of general relativity and analyzed via the Bondi–Sachs framework, contribute to cosmic acceleration by leveraging the cumulative nature of gravitational radiation over long time scales and the non-positive-definite character of gravitational energy.

S. C. Ulhoa, F. L. Carneiro, J. W. Maluf2026-05-20
⚛️ general relativity

Gravitational-wave constraints on H0H_0 are robust to (putative) redshift evolution in the binary black hole mass spectrum at current sensitivity

This study demonstrates that current gravitational-wave constraints on the Hubble constant (H0H_0) using spectral-siren cosmology remain robust against potential redshift evolution in the binary black hole mass spectrum, as no compelling evidence for such evolution was found and the resulting systematic uncertainty is subdominant to other modeling choices.

Alessandro Agapito, Viola De Renzis, Michele Mancarella2026-05-20
⚛️ general relativity

Gravitational wave surrogate model for spinning, intermediate mass ratio binaries based on perturbation theory and numerical relativity

This paper introduces BHPTNRSur2dq1e3, a reduced-order surrogate model for gravitational waves from spinning, intermediate-to-large mass ratio binary black holes that combines point particle perturbation theory with numerical relativity calibration to accurately cover mass ratios from 3 to 1000, employing a domain decomposition strategy to handle retrograde spin complexities.

Katie Rink, Ritesh Bachhar, Tousif Islam, Nur E. M. Rifat, Kevin Gonzalez-Quesada, Scott E. Field, Gaurav Khanna, Scott (…)2026-05-19
⚛️ general relativity

Testing the consistency of gravitational waves and large scale structure constraints on dark energy

This paper utilizes effective field theory consistency relations to demonstrate that current constraints on the effective gravitational constant derived from gravitational wave observations are consistent with, and in the case of GW170817 comparable to, those obtained from large-scale structure surveys, thereby validating these independent probes of dark energy.

Antonio Enea Romano, Juan Manuel Cardenas Mancipe2026-05-19
⚛️ general relativity

SPT-3G D1: Axion Early Dark Energy with CMB experiments and DESI

This paper presents updated constraints on axion early dark energy (AEDE) using CMB data from SPT, ACT, and Planck alongside DESI BAO measurements, revealing that while CMB data alone shows no significant evidence for AEDE, the inclusion of DESI data induces a mild preference for the model and significantly reduces the Hubble tension, a shift attributed to existing discrepancies between DESI and CMB datasets in the standard Λ\LambdaCDM model.

A. R. Khalife (for the SPT-3G Collaboration), L. Balkenhol (for the SPT-3G Collaboration), E. Camphuis (for the SPT-3G C (…)2026-05-19
⚛️ general relativity

A Conservative Discontinuous Galerkin Algorithm for Particle Kinetics on Smooth Manifolds

This paper presents a novel, conservative discontinuous Galerkin algorithm for simulating particle kinetics on smooth manifolds that utilizes Hamiltonian formulations to exactly conserve density and energy, incorporates a BGK collision operator with an iterative scheme for preserving collisional invariants, and demonstrates its efficacy through various test cases including rotating geometries and shock problems.

Grant Johnson, Ammar Hakim, James Juno2026-05-19
⚛️ high-energy theory

Ordering-Independent Wheeler-DeWitt Equation for Flat Minisuperspace Models

This paper demonstrates that for flat minisuperspace models with closed Universes, a specific class of operator orderings in the Wheeler-DeWitt equation, which are uniquely determined by path-integral measures and correspond to field redefinition Jacobians, yields physically equivalent quantum theories with identical observables and positive definite inner products.

Victor Franken, Eftychios Kaimakkamis, Hervé Partouche, Nicolaos Toumbas2026-05-19