⚛️ Category

gr-qc

4428 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

Testing Charged Black Holes Embedded in Anisotropic Matter and Surrounded by Plasma through Gravitational Lensing: Bounds from the Sloan Lens ACS Survey

This paper investigates weak gravitational lensing by charged black holes embedded in anisotropic matter and plasma, deriving theoretical lensing observables and using Sloan Lens ACS Survey data to establish stringent mass-independent bounds on the anisotropic matter parameter while finding that charge and plasma effects remain unobservable at optical wavelengths.

Ritesh Pandey, Shubham Kala, Amare Abebe, Hemwati Nandan, G. G. L. Nashed2026-10-15
⚛️ high-energy theory

Linear stability matrix and Lyapunov exponents for stationary spacetime

This paper establishes a unified framework for analyzing the linear stability and Lyapunov exponents of particle orbits in generic stationary spacetimes by extending previous methods beyond circular orbits to a full four-dimensional phase space, with analytical solutions derived for cases admitting a rank-2 Killing tensor and validated through various classical and relativistic examples.

Xu Ye, Shao-Wen Wei2026-10-15
⚛️ general relativity

Quantum noise and torque correlations in a torsion-bar Sagnac speed meter

This paper demonstrates that in the CHRONOS torsion-bar Sagnac speed meter, vacuum fluctuations entering through weakly transmitting mirrors behind the test masses dominate low-frequency quantum noise and significantly degrade sensitivity, revealing that strong torque cancellation alone is insufficient to ensure optimal detector performance.

Yuki Inoue, Mario Onglao, Daiki Tanabe, Masashi Hazumi, Vivek Kumar, Apimook Watcharangkool2026-10-15
⚛️ general relativity

Gravity from generalized entropy

This paper extends the "gravity from entropy" framework to Tsallis, Rényi, and Sharma-Mittal generalized entropies, deriving their common Einstein limit and identifying specific conditions—such as scalar trace curvature dependence or flatness of the entropy generator at the identity—that eliminate the Planck-scale tachyonic spin-2 ghost while yielding ghost-free theories and predicting distinct horizon entropy corrections.

Hussain Gohar2026-10-15
🔭 astrophysics

Identity Crisis: Untangling Mass-Ordering Artifacts from Compact-Object Pairing in Gravitational-Wave Populations

This paper demonstrates that while conventional mass ordering in gravitational-wave data can artificially create certain population features like steep secondary mass declines and equal-mass concentrations, the observed rapid decline in merger rates above a specific secondary mass scale (∼50 M⊙\sim 50\,\mathrm{M}_\odot) in the GWTC-5 catalog necessitates a genuine characteristic mass scale in the underlying astrophysical population, regardless of which component carries it.

Soumendra Kishore Roy, Asad Hussain, L. A. C. van Son, Maya Fishbach, Carl L. Rodriguez, Will M. Farr2026-10-15
⚛️ general relativity

The WDM time-frequency transform in gravitational-wave data analysis II: Evolutionary spectrum and noise covariance

This paper introduces an evolutionary power spectrum framework within the Wilson-Daubechies-Meyer time-frequency basis to accurately model nonstationary gravitational-wave noise, demonstrating that while diagonal covariance approximations suffice for narrow-band analysis, they fail for broad-band scenarios and require specific mitigation strategies to prevent inference biases and signal-to-noise ratio losses.

Aaron D. Johnson, Katerina Chatziioannou, Robert Rosati2026-10-15
⚛️ general relativity

Strong-Field Gravitational-Wave Lensing from Ray-Traced Arrival-Time Surfaces

This paper introduces a new Hamilton–Jacobi-based formalism that constructs arrival-time surfaces without the thin-lens approximation to accurately model strong-field gravitational-wave lensing, successfully bridging the gap between geometric optics and wave optics regimes for sources ranging from deep within a black hole's gravity (∼6M\sim 6M) to the weak field.

Luka Vujeva, João S. Santos, Brian C. Seymour2026-10-15