⚛️ Category

gr-qc

3826 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

Compact stars in a large-tension braneworld: mildly negative Weyl coupling consistent with NICER and gravitational-wave data

By applying Bayesian inference to multi-messenger observations from NICER and LIGO/Virgo, this study demonstrates that a large-tension braneworld model with a mildly negative Weyl coupling is consistent with current data on compact stars, predicting slightly larger maximum masses and radii than standard General Relativity without requiring significant deviations from it.

Samuel Isidoro dos Santos Júnior, Rafael Camargo Rodrigues de Lima, Pedro Henrique Ribeiro da Silva Moraes2026-07-14
⚛️ general relativity

Black-bounce spacetime and galactic rotation curves: from singularity resolution to observable gravitational effects

This paper investigates the black-bounce spacetime as a singularity-free alternative to classical black holes by analyzing its horizon structure and Solar System constraints, and for the first time, applies it to galactic dynamics to derive an observational constraint on the bounce parameter (a≈1.035a \approx 1.035 kpc) from the rotation curve of NGC 7331.

Farook Rahaman Aritra Sanyal Saibal Ray2026-07-14
⚛️ general relativity

Perturbative aspects of analogue FLRW spacetime Jellium models

This paper investigates electro-acoustic perturbative modes in expanding FLRW Jellium models by providing novel analytic solutions and numerical evaluations of their linear and nonlinear evolution, while introducing a scale-dependent power spectrum to bridge theoretical predictions with experimental observations.

Matheus E. Pereira, Hermano Velten, Francisco B. Lustosa, Alexandre G. M. Schmidt2026-07-14✓ Author reviewed ⓘ
⚛️ high-energy theory

Carrollian limit of NS-NS and Heterotic Supergravity

This paper constructs the Carrollian limit of NS-NS and heterotic supergravity by employing an ultra-relativistic expansion with specific field scalings to ensure a finite action, derives the resulting equations of motion, demonstrates the finiteness of leading α′\alpha'-corrected curvature terms, and explores connections to Carrollian string theory.

Romina Ballesteros, Eric Lescano, Sergio Patiño-López2026-07-14
⚛️ general relativity

GRACE: An Open-Source Framework for GPU-Accelerated Numerical Relativity

This paper introduces GRACE, a new open-source, GPU-accelerated numerical relativity framework built on Kokkos and p4est that couples ideal GRMHD with the Z4c formulation of Einstein's equations, demonstrating high performance and accuracy through extensive validation tests and binary neutron star merger simulations.

Carlo Musolino, Christian Ecker, Konrad Topolski, Marie Cassing, Keneth Miler, Harry Ho-Yin Ng, Khalil Pierre, Elias R. (…)2026-07-14
⚛️ general relativity

Probing the Strong Equivalence Principle through the External Field Effect. How Do Two Masses Fall?

This paper investigates how the External Field Effect in Modified Newtonian Dynamics (MOND) violates the Strong Equivalence Principle by causing a transverse deviation in the mutual attraction of two masses in a radial external field, and evaluates the extreme spatial and temporal sensitivities required to detect this effect in laboratory or space-based experiments.

Ankit Kumar, Kelvin Tang Tee Tniam, Peng Chengxiaohe, Ng Li Yang, P. Arumugam, Tom Złośnik, Yen-Kheng Lim, Tomasz Patere (…)2026-07-14
⚛️ general relativity

Circular orbits and particle collisions close to charged black holes surrounded by scalar clouds

This paper investigates the motion and collisions of massive test particles around charged black holes with scalar hair, revealing that scalar fields enable up to four circular orbits and shift the critical charge required for infinite center-of-mass energy collisions compared to the standard Reissner-Nordström spacetime.

Maria Chivers, Betti Hartmann, Katherine Horton, Yves Brihaye2026-07-14
⚛️ general relativity

Geodesics and shadows of the spindle-deformed Kerr black hole

This paper investigates geodesic motion and black hole shadows in a newly constructed spindle-deformed Kerr spacetime, demonstrating that while the Hamilton-Jacobi equation is generally non-separable, null geodesics become perturbatively separable at order B2B^2, enabling analytical predictions of photon orbits and shadows that are validated against numerical ray tracing.

Hong-Da Lyu, Mingzhi Wang, Shoulong Li2026-07-14