⚛️ Category

gr-qc

3949 papers

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.

⚛️ general relativity

Rigidity aspects of a cosmological singularity theorem

This paper improves a singularity theorem by Galloway and Ling for globally hyperbolic spacetimes satisfying the null energy condition with 2-convex Cauchy surfaces, establishing that such spacetimes are either past null geodesically incomplete or possess specific topological structures (spherical spaces or surface bundles), while also relaxing convexity requirements under U(1)U(1) isometry and strengthening conclusions for non-orientable, non-prime, or specific Haken manifolds without needing finite covers.

Eric Ling, Carl Rossdeutscher, Walter Simon, Roland Steinbauer2026-03-30
⚛️ general relativity

Motion of a charged test particle around a static black hole in a monopole magnetic field

This paper demonstrates that while a monopole magnetic field does not alter the radial motion of a charged test particle around a static black hole, it drastically constrains tangential motion to a thin cone, suggesting the possibility of hot plasma lumps hovering above the black hole.

Ken-ichi Nakao, Yota Endo, Hideki Ishihara, Kenta Matsuo, Kensuke Sueto, Koudai Ueda, Hirotaka Yoshino2026-03-30
⚛️ general relativity

Static Charged Polytropic Spheres with a Cosmological Constant: Physical Acceptability and Trapped Orbits

This paper numerically analyzes physically acceptable static charged polytropic spheres with a cosmological constant to determine the conditions under which internal trapping of circular geodesics occurs for various particle types, revealing that while neutral null particles are trapped purely by geometry, the trapping of other particles also depends on their intrinsic charge and energy.

Alex Stornelli, Anish Agashe2026-03-30
🔭 astrophysics

A Bell Experiment in an Entangled Universe

This paper proposes that interactions between gravitons and inflatons during the inflationary period, combined with horizon-induced "which-path" information, generate entangled graviton states that produce a measurable quantum signature in the scalar four-point correlation function, potentially observable through high-order galaxy correlations like halo bias and intrinsic alignment.

Pablo Tejerina-Pérez, Daniele Bertacca, Raul Jimenez, Leonid Sarieddine2026-03-30
🔭 astrophysics

A Bell experiment during inflation: probing quantum entanglement in tensor fluctuations through correlations of primordial scalar curvature perturbations

This paper proposes a method to test the quantum origin of primordial fluctuations by constructing a Bell inequality from the eight-point correlation function of scalar curvature perturbations, which encodes polarization entanglement from pairs of gravitons generated during inflation.

Pablo Tejerina-Pérez, Leonid Sarieddine, Daniele Bertacca, Raul Jimenez2026-03-30
⚛️ general relativity

Detectability and Systematic Bias from First-Order Phase-Transition Dephasing in Kerr EMRIs

This paper demonstrates that while a first-order phase transition in Kerr extreme mass-ratio inspirals may not significantly hinder gravitational-wave detectability due to small overall waveform mismatches, the resulting large cumulative dephasing creates a bias-sensitive regime that compromises the faithfulness of precision parameter inference, thereby motivating the inclusion of transition sectors in future LISA waveform models.

Jingxu Wu, Liangyu Luo, Junyi Zhang, Jiyun Yang, Haoxiang Ma, Jie Shi2026-03-30
⚛️ general relativity

Narrowband searches for continuous gravitational waves from known pulsars in the first two parts of the fourth LIGO--Virgo--KAGRA observing run

This paper presents the largest narrowband continuous gravitational wave search to date in the advanced detector era, analyzing data from the first two parts of the fourth LIGO–Virgo–KAGRA observing run for 34 known pulsars (including binary systems) using the 5n-vector pipeline with expanded frequency derivative parameters, which yielded no detections but established stringent upper limits, including a tight constraint on the Crab pulsar at less than 0.04% of its spin-down power.

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, A. G. Abac, I. Abouelfettouh, F. (…)2026-03-30