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.

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 $\Lambda$ CDM model.

A. R. Khalife (for the SPT-3G Collaboration), L. Balkenhol (for the SPT-3G Collaboration), E. Camphuis (for the SPT-3G Collaboration), A. J. Anderson (for the SPT-3G Collaboration), B. Ansarinejad (fo (…)2026-05-19⚛️ gr-qc

Quasi-dust ekpyrotic scenario in Loop Quantum Cosmology

This paper proposes a viable Loop Quantum Cosmology model featuring a quasi-dust scalar field and an ekpyrotic field that together generate a matter-bounce with scale-invariant perturbations, suppress anisotropies, and produce a red-tilted power spectrum consistent with current observations.

Emmanuel Frion, Mateo Pascual, Francesca Vidotto2026-05-19⚛️ gr-qc

Conformal Blocks in 2d Carrollian/Galilean CFTs and Excited State Entanglement Entropy

This paper establishes the Flat/CCFT correspondence by deriving the entanglement entropy of highly excited states in 2d Carrollian/Galilean CFTs, which matches holographic results from 3D Einstein gravity and confirms the Eigenstate Thermalization Hypothesis while defining a precise dictionary between boundary and bulk parameters.

Peng-Xiang Hao, Shunta Takahashi2026-05-19⚛️ gr-qc

The effects of dark energy on the matter-gravity coupling

This paper demonstrates that dark energy perturbations modify cosmological evolution by introducing a momentum, space, and polarization-dependent effective matter-gravity coupling, which can become locally negative to explain observed structure suppression and induce polarization- and frequency-dependent effects in gravitational waves from compact binary coalescences.

Antonio Enea Romano2026-05-19⚛️ gr-qc

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⚛️ gr-qc

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⚛️ hep-th

Finite time pseudo-rip singularity in cosmology

This paper introduces and analyzes a novel finite-time pseudo-rip (FTPR) cosmological singularity, characterized by a preceding super-accelerated phantom phase and violations of all energy conditions, which is shown to be a weak singularity that can be incorporated into a model mimicking the past expansion history of the standard $\Lambda$ CDM universe.

Mariusz P. Dąbrowski, Teodor Borislavov Vasilev2026-05-19⚛️ gr-qc

Image of a wormhole with an arbitrary throat profile

This paper investigates the observable signatures of static, spherically symmetric wormholes with arbitrary throat profiles, demonstrating that while their shadow and silhouette radii can mimic those of a Schwarzschild black hole, their accretion disk images are distinctly brighter due to the dominant role of the Doppler effect over gravitational redshift.

Valeria A. Ishkaeva, Sergey V. Sushkov2026-05-19⚛️ gr-qc

Particle Dynamics, Shadow and Hawking Sparsity of a Kalb-Ramond Black Hole Coupled to Nonlinear Electrodynamics

This paper investigates the geodesic structure, black hole shadow, and Hawking sparsity of a static, spherically symmetric black hole sourced by a Kalb-Ramond field coupled to nonlinear electrodynamics, demonstrating that the combined effects of the field and magnetic charge significantly increase the sparsity of the Hawking cascade while maintaining consistency with Event Horizon Telescope observations of M87* and Sgr A*.

Faizuddin Ahmed, Ahmad Al-Badawi, żzzet Sakallı2026-05-19⚛️ gr-qc

Bouncing singularities in Schwarzschild: a geometric origin of the QNM convergence region

This paper analytically demonstrates that the convergence region of the Schwarzschild quasinormal mode expansion is determined by a geometric "bouncing singularity" in the complex time plane, caused by a null geodesic reflecting off the black hole singularity, which explains the observed bounds on real-time convergence and the annular convergence of Matsubara mode sums.

Paolo Arnaudo, Benjamin Withers2026-05-19⚛️ gr-qc

← Previous Next →