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.

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

Geodesic Completeness in General Cosmological Scenarios

This paper generalizes the Borde-Guth-Vilenkin theorem to demonstrate that geodesic past-incompleteness is a generic feature of various cosmological scenarios beyond standard inflation, including inhomogeneous and cyclic models such as the one proposed by Ijjas and Steinhardt.

William H. Kinney (Univ. at Buffalo, SUNY)2026-04-23⚛️ gr-qc

Cosmological higher-curvature gravities

This paper introduces and systematically explores "Cosmological Gravities," a class of higher-curvature theories in dimensions $D \geq 3$ where Friedmann-Lemaître-Robertson-Walker configurations and scalar cosmological perturbations obey equations of motion that are at most second-order in derivatives, while also deriving explicit instances of these theories and their non-hairy Schwarzschild generalizations.

Javier Moreno, Ángel J. Murcia2026-04-22⚛️ gr-qc

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⚛️ hep-ex

Black-hole spectroscopy from a giant quantum vortex

This paper demonstrates that a giant quantum vortex in superfluid helium-4 can emulate a rotating black hole's spacetime geometry, enabling the laboratory detection of multiple damped quasinormal modes that are typically difficult to observe in astrophysical settings due to their rapid decay.

Pietro Smaniotto, Leonardo Solidoro, Patrik Švančara, Sam Patrick, Maurício Richartz, Carlo F. Barenghi, Ruth Gregory, Silke Weinfurtner2026-04-22⚛️ gr-qc

3D full-GR simulations of magnetorotational core-collapse supernovae on GPUs: A systematic study of rotation rates and magnetic fields

Using GPU-accelerated 3D general-relativistic magnetohydrodynamics simulations on the Frontier supercomputer, this systematic study of a $25\, M_\odot$ progenitor reveals that while magnetic fields of $10^{11}\, \mathrm{G}$ fail to drive explosions, fields of $10^{12}\, \mathrm{G}$ combined with varying rotation rates produce diverse outcomes ranging from spherical, neutrino-like explosions to high-velocity jets characteristic of broad-lined type Ic supernovae.

Swapnil Shankar, Philipp Mösta, Roland Haas, Erik Schnetter2026-04-22⚛️ gr-qc

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⚛️ gr-qc

Wormhole Nucleation via Topological Surgery in Lorentzian Geometry

This paper demonstrates that a wormhole can be nucleated in classical general relativity without singularities by using topological surgery and a connected sum with $\mathbb{CP}^{2}$ to resolve the critical point, a process that inevitably violates standard energy conditions and introduces closed timelike curves.

Alessandro Pisana, Barak Shoshany, Stathis Antoniou, Louis H. Kauffman, Sofia Lambropoulou2026-04-22⚛️ gr-qc

Black holes of multiple horizons without mass inflation

This paper constructs black hole solutions with multiple horizons that avoid mass inflation by utilizing a nonlinear Maxwell field to make coincident inner horizons have vanishing surface gravity, thereby eliminating the exponential growth of perturbations.

Changjun Gao, Toktarbay Saken2026-04-22⚛️ hep-th

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