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.

Critical collapse of a self-interacting scalar field in asymptotically anti-de Sitter spacetime

This paper demonstrates that the critical gravitational collapse of a self-interacting scalar field in asymptotically anti-de Sitter spacetime exhibits type II behavior with universal echoing periods and critical exponents that remain invariant across different AdS curvature radii, confirming that the specific form of the scalar field potential does not significantly alter the critical collapse dynamics.

Li-Jie Xin, Xiangdong Zhang2026-06-03⚛️ gr-qc

Biased tracers, Hybrid Effective Field Theory and Modified Gravity

This paper extends the Hybrid Effective Field Theory (HEFT) framework to modified gravity cosmologies, specifically $f(R)$ gravity, by detailing the perturbative biased expansion required to compute loop-corrected power spectra and proposing a strategy to adapt existing $\Lambda$ CDM emulators for these beyond-standard-model scenarios.

Guilherme Brando, Baojiu Li, Kazuya Koyama2026-06-03⚛️ gr-qc

Positive resolution of Bartnik's cosmological splitting conjecture

This paper proves Robert Bartnik's 1988 cosmological splitting conjecture by demonstrating that a timelike geodesically complete, globally hyperbolic spacetime with compact Cauchy surfaces satisfying the strong energy condition must split isometrically as a Lorentzian product, utilizing global viscosity solutions to the Lorentzian eikonal equation and an elliptic approach involving the $p$ -d'Alembertian operator for $p < 1$ .

Robert J. McCann, Argam Ohanyan2026-06-03⚛️ gr-qc

Pure states for subregions in gravity and their entanglement entropy

This paper proposes a framework where spatial subregions in quantum gravity are assigned pure states via a partially frozen gravitational path integral, leading to a new holographic prescription for entanglement entropy that satisfies key consistency conditions and introduces an observer-dependent entanglement wedge.

Zixia Wei2026-06-03⚛️ hep-th

Type D Spacetimes and the Weyl Double Copy

This paper establishes a universal "Weyl double copy" relation for all four-dimensional type D vacuum spacetimes, linking their gravitational curvature to electromagnetic field strengths and resolving ambiguities in previous Kerr-Schild formulations while providing new double-copy interpretations for the C-metric and Eguchi-Hanson instanton.

Andres Luna, Ricardo Monteiro, Isobel Nicholson, Donal O'Connell2026-06-02⚛️ hep-th

Cosmology with the angular cross-correlation of gravitational-wave and galaxy catalogs: forecasts for next-generation interferometers and the Euclid survey

This paper forecasts that the angular cross-correlation of next-generation gravitational-wave catalogs with the Euclid galaxy survey can constrain the Hubble constant to percent-level precision and significantly improve cosmological constraints, provided multiple interferometers enable precise sky localization.

Alessandro Pedrotti, Michele Mancarella, Julien Bel, Michele Santoni, Davide Gerosa2026-06-02⚛️ gr-qc

Well-posed geometric boundary data in General Relativity, I: Dirichlet boundary data

This paper establishes the local-in-time well-posedness of the initial-boundary value problem for vacuum Einstein equations with Dirichlet boundary data, contingent on the Brown-York stress tensor satisfying a convexity-type condition that ensures it shares the same Lorentzian signature as the induced boundary metric.

Zhongshan An, Michael T. Anderson2026-06-02⚛️ gr-qc

Well-posed geometric boundary data in General Relativity, II: twisted Dirichlet boundary data

This paper establishes the local-in-time well-posedness of the initial-boundary value problem for the vacuum Einstein equations under twisted Dirichlet boundary conditions, which specify the pointwise conformal class of the boundary metric and a scalar density derived from the bulk and boundary volume forms.

Zhongshan An, Michael T. Anderson2026-06-02⚛️ gr-qc

Operator Algebras and Third Quantization

The paper proposes a novel operator algebraic framework called "Poissonization" to describe the rare topology-changing events in quantum gravity as a universal Poisson process, thereby explaining late-time spectral form factor plateaus and unifying the description of baby universe statistics and multi-boundary correlators across various models like Marolf-Maxfield and Jackiw-Teitelboim gravity.

Yidong Chen, Marius Junge, Nima Lashkari2026-06-02🔢 math-ph

Gravitational Bound State Perturbations Inside Black Holes and Isospectrality

This paper demonstrates that polar perturbations inside a Schwarzschild black hole possess $\ell-1$ bound states, where $\ell-2$ of them are isospectral to axial perturbations while the remaining algebraically special mode serves as the ground state, collectively yielding an equally spaced spectrum that implies black hole area quantization of $\Delta A = 16 \pi l_{\mathrm{Pl}}^2$ .

Hassan Firouzjahi, Kazem Rezazadeh, Masoud Molaei2026-06-02⚛️ gr-qc

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