gr-qc papers | Gist.Science

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.

Wave Packet Propagation in Tilted Weyl Semimetals for Black Hole Analog Systems

This paper demonstrates that spatially varying tilts in Weyl semimetals can create two distinct types of analog black hole horizons—one reflecting and one transmitting wave packets—where zero-momentum packets experience maximal horizon effects and probability loss correlated with their dwell time, establishing these materials as a tunable platform for studying quantum information dynamics near gravitational horizons.

M. A. Lozande, E. A. Fajardo2026-04-21🔬 cond-mat.mes-hall

A note on complete gauge-fixing and the constraint algebra

This paper establishes that the admissibility of complete gauge-fixing is determined solely by the invertibility of the gauge-fixing constraint matrix, as the combined constraint determinant factorizes to decouple the second-class sector, thereby unifying Hamiltonian and Lagrangian completeness criteria and ensuring robustness in modified gravity theories.

Ganga Singh Manchanda2026-04-21⚛️ gr-qc

Transiently accelerating cosmological model with Gong-Zhang parametrization in $f(T)$ teleparallel gravity

This paper proposes a transiently accelerating cosmological model within $f(T)$ teleparallel gravity using a power-law function and Gong-Zhang parametrization, which is validated against observational data to reveal a quintessence-like behavior that predicts a future transition from acceleration to deceleration while satisfying thermodynamic constraints.

Khomesh R. Patle, G. P. Singh2026-04-21⚛️ gr-qc

Nuclear Heterodyne Interferometry for Gravitational Spectroscopy

This paper proposes a new method for nuclear gravitational spectroscopy using phase-sensitive heterodyne interferometry of time-resolved nuclear resonant scattering, which converts gravitational redshift detection into a time-domain measurement capable of achieving percent-level precision on General Relativity deviations within hours on a few-meter-scale baseline.

Ralf Röhlsberger2026-04-21⚛️ gr-qc

CaTherine wheels from trees and Liouville quantum gravity

This paper establishes necessary and sufficient conditions for a topological tree in the sphere to arise from a CaTherine wheel, a result the authors use to prove the existence and uniqueness of a space-filling curve corresponding to the geodesic tree of $\gamma$ -Liouville quantum gravity for $\gamma \in (0,2)$ .

Danny Calegari, Ewain Gwynne2026-04-21⚛️ gr-qc

Quasinormal modes of the generalized JMN naked singularity using exact WKB analysis

This paper employs exact WKB analysis to demonstrate that the bow-shaped deformation of Stokes curves in the complex radial plane serves as a unique topological signature of the generalized JMN naked singularity, distinguishing it from black hole spacetimes by revealing a logarithmic branch-point singularity at the origin.

Aryansh Saxena, Suresh C. Jaryal, K. K. Sharma2026-04-21⚛️ gr-qc

Geometric deformations of symmetric spacetimes with a string cloud

This paper establishes a unified deformation framework that constructs four-dimensional string-cloud spacetimes from three-dimensional $\eta$ -Einstein metrics, demonstrating that the expansion history of symmetric cosmological models and the horizon structure of Reissner-Nordström-(A)dS black holes remain unchanged despite the deformation.

Hiroshi Kozaki, Satsuki Matsuno, Tatsuhiko Koike, Yoshiyuki Morisawa, Hideki Ishihara2026-04-21⚛️ gr-qc

Weak Gravitational Lensing: A Brief Overview

This paper provides a comprehensive analysis of weak gravitational lensing by developing relativistic formulations for light deflection in static and rotating spacetimes, deriving analytical expressions for photon orbits, and applying advanced methods like the Rindler-Ishak approach, Gauss-Bonnet theorem, and optical invariants to establish a unified geometrical framework for computing bending angles.

Partha Pratim Basumallick, Saheb Das, Bhaswati Mandal, Subhadip Sau2026-04-21⚛️ gr-qc

A Unified Bogoliubov Approach to Primordial Gravitational Waves: From Inflation to Reheating

This paper presents an improved, publicly available numerical method based on the Bogoliubov approach that overcomes existing instabilities to accurately calculate the full spectrum of primordial gravitational waves from inflation through reheating, revealing how inflaton anharmonicity imprints distinct features on high-frequency signals.

Yubing Wang, Quan-feng Wu, Xun-Jie Xu2026-04-21⚛️ hep-ph

Comment on Cosmological constraints on unimodular gravity models with diffusion (arXiv:2211.07424): thermodynamic inadmissibility of the H0 tension resolution mechanism

This paper demonstrates that diffusion-based Unimodular Gravity models proposed to resolve the $H_0$ tension are thermodynamically inadmissible because they violate the second law of thermodynamics by requiring a negative energy transfer rate ( $\dot{Q} < 0$ ) that contradicts the necessary condition for alleviating the tension.

Mauricio Cataldo2026-04-21⚛️ gr-qc

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