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.

Cancellation of one-parameter graviton gauge dependence in the effective scalar field equation in de Sitter

This paper demonstrates that the gauge dependence of one-graviton-loop corrections to the effective field equation of a massless, minimally coupled scalar in de Sitter space cancels out when contributions from all diagram classes, including one-loop corrections to external mode functions, are consistently collected, thereby supporting the construction of gauge-independent cosmological quantum-gravitational observables.

Dražen Glavan, Shun-Pei Miao, Tomislav Prokopec, Richard P. Woodard2026-04-23⚛️ gr-qc

Van der Waals Gravity Theory

This paper proposes a modified theory of gravity inspired by the van der Waals equation of state, which treats spacetime as a non-ideal thermodynamic system to derive field equations with a dynamical gravitational coupling that naturally resolves the initial Big Bang singularity and yields non-singular black hole solutions.

H. R. Fazlollahi2026-04-23⚛️ gr-qc

Greybody Factor, Resonant Frequencies, and Entropy Quantization of Charged Scalar Fields in the Kerr-EMDA Black Hole

This paper investigates charged massive scalar field perturbations on the Kerr-EMDA black hole background by deriving exact analytical solutions in terms of confluent Heun functions to determine a mass-dependent resonant frequency spectrum, a parameter-dependent entropy quantization that diverges at extremality, and the first closed-form greybody factor for this geometry, thereby revealing how electromagnetic coupling and dilaton deformation fundamentally alter the black hole's wave scattering and thermodynamic properties compared to standard Kerr and Kerr-Newman cases.

Nazım Sertkan, İzzet Sakallı2026-04-23⚛️ gr-qc

Black Hole Interiors as a Laboratory for Time-Dependent Classical Double Copy

This paper demonstrates that the trapped interiors of black holes provide an exact, time-dependent framework for the classical double copy, proving that regular solutions like the Bardeen black hole yield finite single-copy gauge fields that satisfy standard energy conditions even when the corresponding gravitational core violates them.

Damien A. Easson, Tucker Manton2026-04-23⚛️ hep-th

Two-Point Padé Approximants for the Deflection of Light in the Schwarzschild Black Hole Metric

This paper presents [2,2] two-point Padé approximants and a simpler quadratic approximation to accurately model the deflection angle of light in the Schwarzschild metric across the full range of impact parameters greater than the critical value, bridging the gap between weak-field and strong-field regimes.

Don N. Page2026-04-23⚛️ gr-qc

Technically Natural Suppression of Fifth Force

This paper proposes a $Z_2$ -symmetric mirror extension of the Standard Model within a bi-conformal gravity framework where spontaneous scale invariance breaking generates a light scalaron that naturally suppresses fifth-force couplings via symmetry, predicting a specific correlation between the force strength and scalar mass that aligns with next-generation experimental targets without relying on environmental screening mechanisms.

Kensuke Homma, Taishi Katsuragawa, Shinya Matsuzaki2026-04-23⚛️ hep-ex

The phase diagram of confining holographic theories on constant curvature manifolds in the presence of a $\theta$ -angle

This paper investigates the phase diagrams of confining holographic theories on constant curvature manifolds with a $\theta$ -angle, revealing that negative curvature manifolds exhibit no phase transitions while positive curvature manifolds display both first and second-order phase transitions, alongside a proof of a holographic Vafa-Witten-like theorem for the $\theta=0$ case.

Ahmad Ghodsi, Elias Kiritsis, Francesco Nitti2026-04-23⚛️ hep-th

Reshaping the inner shadow of a Kerr black hole by a torn accretion disk

This study demonstrates that a torn accretion disk, formed by the disruption of a tilted disk around a Kerr black hole, fundamentally reshapes the inner shadow into exotic morphologies like bifurcated structures and crescents, thereby challenging the reliability of using standard shadow shapes as sole diagnostics for testing gravity theories.

Shiyang Hu, Dan Li, Chen Deng, Kejian He2026-04-23⚛️ gr-qc

Rank-2 Electromagnetic Backgrounds and Angular Momentum Barriers in Gravitomagnetic Spin-Quadrupole Searches

This paper analyzes the angular momentum selection rules and identifies four dominant electromagnetic background barriers that constrain spectroscopic searches for gravitomagnetic spin-quadrupole coupling in highly charged ions, ultimately deriving the specific multi-isotope experimental topology required to isolate the gravitational signal and establishing a preliminary laboratory bound on the gyrogravitational ratio.

Leonardo A. Pachon2026-04-23⚛️ nucl-th

Gravity mediated entanglement of phonons in Bose-Einstein condensates

This paper proposes a Quantum Gravity Induced Entanglement of Phonons (QGEP) protocol using two Bose-Einstein condensates, demonstrating that gravity-mediated entanglement between their phonon modes can be significantly stronger and more robust than the standard QGEM protocol for massive particles, particularly at low separation distances and with increased particle numbers.

Soham Sen, Sunandan Gangopadhyay, Vlatko Vedral2026-04-23⚛️ hep-th

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