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.

⚛️ general relativity

Isotropic Equivalence of STVG--MOG and $Λ$ CDM and Its Breakdown in Large--Scale Anisotropic Cosmological Observables

The paper demonstrates that Scalar-Tensor-Vector Gravity (STVG-MOG) is observationally indistinguishable from the standard $\Lambda$ CDM model across all isotropic and linear cosmological probes, but this equivalence breaks down at large scales where anisotropic observables, such as enhanced radio-galaxy dipoles, reveal distinct gravitational responses that can empirically differentiate modified gravity from particle dark matter.

John W. Moffat2026-02-04

⚛️ general relativity

Scale-Invariant Bounce Cosmology in Weyl f(Q) Gravity with Quintom Signature

This paper proposes a nonsingular bouncing cosmological model within Weyl-type $f(Q)$ gravity that resolves the initial singularity through a quintom-like equation of state violating the null energy condition, thereby facilitating a transition from contraction to accelerated expansion while offering insights into early universe dynamics and dark energy.

Rita Rani, G. K. Goswami, J. K. Singh, Sushant G. Ghosh, Sunil D Maharaj2026-02-04

⚛️ high-energy theory

Observational signatures of charged Bardeen black holes in perfect fluid dark matter with a cloud of strings

This paper investigates the observational signatures of a charged Bardeen black hole surrounded by perfect fluid dark matter and a cloud of strings, demonstrating how these parameters uniquely influence horizon structures, shadow sizes, particle dynamics, and wave scattering to enable independent constraints via astrophysical measurements.

Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı2026-02-04

⚛️ general relativity

Matching collapse and expansion across Matter Trapping surfaces in inhomogeneous $Λ$ CDM models

This paper demonstrates that Matter Trapping surfaces in spherically symmetric dust-plus- $\Lambda$ models act as characteristic boundaries allowing for infinite, independent solutions across them, a property illustrated through $\Lambda$ CDM, Schwarzschild-de Sitter, and a newly identified static, stable LTBdS model.

Alan Maciel, M. Le Delliou, José P. Mimoso2026-02-04

⚛️ high-energy theory

Probing the Charged Hayward Black Hole in Dark Matter and String Cloud Environments through Shadow, Geodesics, and Quasinormal Spectrum

This paper investigates the physical properties of a charged Bardeen black hole immersed in perfect fluid dark matter and a string cloud, analyzing how these environmental parameters influence the horizon structure, photon shadow, particle geodesics, quasinormal modes, and greybody factors to propose methods for independently constraining the model's parameters through astrophysical observations.

Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı2026-02-04

🔢 mathematics

Complexity and the Hilbert space dimension of 3D gravity

This paper employs quantum dynamical Krylov complexity to demonstrate that the Hilbert space dimension of a black hole in 2+1-dimensional Anti-de Sitter space equals the exponential of its Bekenstein-Hawking entropy, derived from the late-time saturation of state spread in a chaotic $SL(2,\mathbb{R})$ system.

Vijay Balasubramanian, Rathindra Nath Das, Johanna Erdmenger, Jonathan Karl, Herman Verlinde2026-02-04

⚛️ high-energy theory

Pseudospectra of holographic diffusion: gauge fields breaking free from the master scalar

This paper demonstrates that the pseudospectra of a U(1) gauge field in Schwarzschild-AdS black branes, computed via a novel direct gauge-field approach, coincide with those from the conventional master scalar method, revealing that while the hydrodynamic diffusive frequency is spectrally stable, the corresponding hydrodynamic momenta exhibit enhanced instability due to a pole-collision at zero frequency.

David Garcia-Fariña, Karl Landsteiner, Pau G. Romeu, Pablo Saura-Bastida2026-02-04

⚛️ high-energy theory

From AdS to Flat Space: Massive Spin-2 Fields

This paper analyzes a holographic effective field theory of a charged massive spin-2 field in AdS space to derive explicit mappings between bulk couplings and boundary CFT data, ultimately verifying that the flat-space limit of the resulting momentum-space correlators reproduces the expected scattering amplitudes.

Vijay Nenmeli, Arvind Shekar, Mritunjay Verma2026-02-04

⚛️ high-energy theory

Consistent Evaluation of the No-Boundary Proposal

By consistently applying the gravitational path integral to compute both amplitudes and normalization norms, this paper demonstrates that the Hartle-Hawking no-boundary proposal predicts probabilities of nearly or exactly one for closed universes, implying that all relevant cosmological states are effectively parallel to the Hartle-Hawking state.

Ahmed I. Abdalla, Stefano Antonini, Raphael Bousso, Luca V. Iliesiu, Adam Levine, Arvin Shahbazi-Moghaddam2026-02-04

⚛️ general relativity

Comment on ''The space-time line element for static ellipsoidal objects''

This paper demonstrates that a recently proposed static ellipsoidal metric, along with a cited alternative, fails to represent a vacuum solution because it yields non-zero Einstein tensor components, Ricci scalar, and fluid pressures when analyzed using Maple's differential geometry package.

Antonio C. Gutiérrez-Piñeres2026-02-04

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gr-qc

Isotropic Equivalence of STVG--MOG and ΛΛΛCDM and Its Breakdown in Large--Scale Anisotropic Cosmological Observables

Scale-Invariant Bounce Cosmology in Weyl f(Q) Gravity with Quintom Signature

Observational signatures of charged Bardeen black holes in perfect fluid dark matter with a cloud of strings

Matching collapse and expansion across Matter Trapping surfaces in inhomogeneous ΛΛΛCDM models

Probing the Charged Hayward Black Hole in Dark Matter and String Cloud Environments through Shadow, Geodesics, and Quasinormal Spectrum

Complexity and the Hilbert space dimension of 3D gravity

Pseudospectra of holographic diffusion: gauge fields breaking free from the master scalar

From AdS to Flat Space: Massive Spin-2 Fields

Consistent Evaluation of the No-Boundary Proposal

Comment on ''The space-time line element for static ellipsoidal objects''

Isotropic Equivalence of STVG--MOG and $Λ$ CDM and Its Breakdown in Large--Scale Anisotropic Cosmological Observables

Matching collapse and expansion across Matter Trapping surfaces in inhomogeneous $Λ$ CDM models