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

Finite-Momentum Kinetic Corrections to Viscous Tensor Perturbations in an Expanding Universe

This paper investigates finite-momentum kinetic corrections to viscous tensor perturbations in an expanding universe by solving the Boltzmann equation beyond the local relaxation-time approximation, revealing a stable, nonmonotonic correction of up to approximately 5.6% to the tensor power transfer function that deviates from standard Maxwell-Cattaneo or Muller-Israel-Stewart models.

Nishil Savla, Gurudatt Gaur2026-08-21

⚛️ general relativity

Galactic microlensing by Lobo-Parsaei-Riazi phantom wormhole: Paczynski light curves and probabilistic features

This paper investigates Galactic microlensing signatures of the bounded Lobo-Parsaei-Riazi phantom wormhole, deriving deflection angles and light curves to demonstrate how the equation-of-state parameter $\gamma$ distinguishes between massive wormholes that mimic Schwarzschild black holes and massless wormholes that produce qualitatively different optical effects.

G. F. Akhtaryanova, R. Kh. Karimov, R. N. Izmailov, U. K. Khidirov2026-08-21

⚛️ general relativity

Kerr Quasinormal Modes without Variable Separation: A Two-Dimensional Hyperboloidal Teukolsky Solver with Physics-Informed Neural Networks

This paper demonstrates that physics-informed neural networks can accurately solve the two-dimensional, non-separable Teukolsky equation for Kerr black hole quasinormal modes, offering a flexible alternative to traditional spectral methods that avoids variable separation and maintains high precision even in the near-extremal regime.

Antonio Ferrer-Sánchez, Daniela D. Doneva, José D. Martín-Guerrero, Stoytcho S. Yazadjiev, Roberto Ruiz de Austri-Bazan (…)2026-08-21

⚛️ phenomenology

Quintessential \alpha-attractors, updated

This paper presents updated quintessential $\alpha$ -attractor models that unify inflation and evolving dark energy within a single-field framework, successfully accommodating higher spectral index values, satisfying dark-radiation constraints, and describing diverse future cosmic scenarios ranging from de Sitter expansion to cosmological collapse.

Renata Kallosh, Andrei Linde, Marina Shmakova, Yusuke Yamada2026-08-21

⚛️ high-energy theory

One more Sine-Gordon soliton in AdS

This paper presents a new single soliton solution in a deformed sine-Gordon theory on AdS spacetime that is unique to the curved geometry and lacks any counterpart in flat space.

D. V. Diakonov2026-08-21

⚛️ high-energy theory

Hilbert space relation from dS to AdS through Reflection Positivity

This paper establishes a novel representation-theoretic link between de Sitter and Anti-de Sitter spaces by demonstrating that composing the invariant Hilbert product with equatorial reflection yields a positive-definite inner product for the complementary series (satisfying the scalar conformal unitarity bound), thereby generating a positive-energy AdS representation that corresponds to the Klebanov-Witten alternative-quantization window without relying on conventional analytic continuation of the radius.

Yu-ki Suzuki2026-08-21

⚛️ general relativity

Dynamics of Charged Radiating Collapse with Shear and Anisotropy

This paper presents an exact solution for a charged, anisotropic, and shearing radiating stellar collapse within the Einstein-Maxwell framework, demonstrating that the resulting model satisfies energy and causality conditions while exhibiting stability against cracking and a positive complexity factor influenced by charge and dissipation.

A. Khalid, Muhammad Bilal Riaz, S. A. Mardan, Mustafa Inc2026-08-21

⚛️ high-energy theory

Singularity-Rank Signatures in Generalized Dirac Oscillators near a BTZ Horizon

This paper investigates singular generalized Dirac-oscillator couplings near a nonextremal BTZ black hole horizon, classifying their mathematical structures by pole order ( $p=1,2$ ) and deriving exact response functions that encode local spinorial data for matching to the complete exterior geometry.

João V. R. Alencar, Allan R. P. Moreira, João B. R. Silva, Abdullah Guvendi2026-08-21

⚛️ general relativity

Spin-Inversion Degeneracies in Restricted Inspiral Waveforms for LISA

This study demonstrates that within restricted inspiral waveforms weighted by LISA's sky-averaged sensitivity, gravitational-wave signals from supermassive black hole binaries undergoing spin inversions remain strongly degenerate with those from binaries without orbital-plane crossings, necessitating more complete waveform models to break this degeneracy.

Kata Karácsonyi, László Árpád Gergely2026-08-21

⚛️ general relativity

An Analytical Two Incompressible Fluid Star with a Mixed Ordinary Dark Matter Core and an Ordinary Matter Envelope

This paper presents an analytical model of a relativistic two-fluid star featuring a mixed core of incompressible ordinary and dark matter surrounded by an ordinary matter envelope, deriving explicit solutions for metric and pressure functions to determine physical constraints and a modified Buchdahl-like compactness limit that recovers the standard Schwarzschild result in the single-fluid limit.

Milko Estrada, Santiago Esteban Perez Bergliaffa2026-08-21

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