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.

⚛️ high-energy experiments

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

⚛️ high-energy theory

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

⚛️ general relativity

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

⚛️ nuclear theory

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

⚛️ high-energy theory

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

⚛️ high-energy experiments

Observable CMB B-modes from Cosmological Phase Transitions

This paper demonstrates that tensor perturbations generated during first-order cosmological phase transitions in a secluded dark sector can produce observable CMB B-mode signals comparable to inflationary predictions, potentially complicating the interpretation of future data but offering a way to distinguish the two scenarios through multi-scale measurements.

Kylar Greene, Aurora Ireland, Gordan Krnjaic, Yuhsin Tsai2026-04-22

⚛️ general relativity

Modular Channels, Thermal Filtering and the Spectral Emergence of Spacetime

This paper proposes the Modular Channels Flow Correspondence (MCFC), a unified framework that derives Einstein's equations and explains the Unruh effect and black hole evaporation as consequences of a universal thermal filtering mechanism governing the spectral dynamics of modular quantum channels.

Pedro J. Trejo-Calderón2026-04-22

⚛️ general relativity

Extracting Properties of Dark Dense Environments around Black Holes from Gravitational Waves

This paper proposes a novel quantity derived from gravitational wave amplitude and frequency derivatives to extract dark matter density profiles around black holes, enabling multi-wavelength observations to probe dark sector properties and constrain primordial black hole origins.

Qianhang Ding, Minxi He, Hui-Yu Zhu2026-04-22

⚛️ general relativity

Fermionic Casimir densities for a uniformly accelerating mirror in the Fulling-Rindler vacuum

This paper investigates the local characteristics of the Fulling-Rindler vacuum for a massive Dirac field in $(D+1)$ -dimensional spacetime with a uniformly accelerating mirror, decomposing the fermion condensate and energy-momentum tensor into boundary-free and boundary-induced contributions to reveal their distinct behaviors near the Rindler horizon and the mirror, as well as their contrasting properties compared to the Minkowski vacuum.

A. A. Saharian, L. Sh. Grigoryan, V. Kh. Kotanjyan2026-04-22

⚛️ nuclear theory

Self-gravitating baryonic tubes supported by $\pi$ - and $\omega$ -mesons and its flat limit

This paper constructs self-gravitating, singularity-free baryonic tube solitons in an $SU(N)$ Einstein non-linear sigma model coupled to $\omega$ -mesons, demonstrating that increasing the number of flavors enhances physical predictions by reducing binding energy despite increasing total energy.

Gonzalo Barriga, Carla Henríquez-Baez, Leonardo Sanhueza, Aldo Vera2026-04-22

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gr-qc

Technically Natural Suppression of Fifth Force

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

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

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

Gravity mediated entanglement of phonons in Bose-Einstein condensates

Observable CMB B-modes from Cosmological Phase Transitions

Modular Channels, Thermal Filtering and the Spectral Emergence of Spacetime

Extracting Properties of Dark Dense Environments around Black Holes from Gravitational Waves

Fermionic Casimir densities for a uniformly accelerating mirror in the Fulling-Rindler vacuum

Self-gravitating baryonic tubes supported by π\piπ- and ω\omegaω-mesons and its flat limit

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

Self-gravitating baryonic tubes supported by $\pi$ - and $\omega$ -mesons and its flat limit