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.

⚛️ high-energy theory

ISCOs and the weak gravity conjecture bound in higher derivative theories of gravity

This paper establishes that demanding the positivity of anomalous dimensions for heavy-light double twist operators in the dual CFT imposes a charge-to-mass ratio bound on charged probes in higher-derivative AdS black holes that exactly matches the Weak Gravity Conjecture, while demonstrating that Innermost Stable Circular Orbits (ISCOs) persist up to this bound with radii decreasing as higher-derivative coupling parameters increase.

Adrinil Paul, Chandrasekhar Bhamidipati2026-04-15

⚛️ general relativity

Gravitational-Wave Parameter Estimation in non-Gaussian noise using Score-Based Likelihood Characterization

This paper introduces a score-based diffusion model approach that learns the empirical distribution of non-Gaussian instrumental noise directly from detector data, enabling unbiased gravitational-wave parameter estimation without the need for traditional data cleaning or computationally expensive joint inference.

Ronan Legin, Maximiliano Isi, Kaze W. K. Wong, Yashar Hezaveh, Laurence Perreault-Levasseur2026-04-15

⚛️ phenomenology

Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity

This paper presents a theoretical framework comparing electromagnetic radiation signatures from scalar fields in modified gravity with those of axion-like particles, demonstrating how distinct parity couplings and resonance effects can produce observable differences to aid in distinguishing between these models.

Wenyi Wang, Sousuke Noda, Taishi Katsuragawa2026-04-15

⚛️ general relativity

BHaHAHA: A Fast, Robust Apparent Horizon Finder Library for Numerical Relativity

The paper introduces BHaHAHA, the first open-source, infrastructure-agnostic library for numerical relativity that utilizes a novel hyperbolic flow-based approach combined with multigrid-inspired refinements and parallelization to achieve robust and significantly faster apparent horizon finding compared to existing methods.

Zachariah B. Etienne, Thiago Assumpção, Leonardo Rosa Werneck, Samuel D. Tootle2026-04-15

⚛️ high-energy theory

A Match Made in Heaven: Linking Observables in Inflationary Cosmology

This paper demonstrates that in dynamical Chern-Simons gravity, the parity-odd trispectrum of curvature perturbations is not an independent observable but can be fully expressed as a rational, factorized "double copy" of the parity-odd graviton power spectrum and the mixed inflaton-graviton bispectrum.

David Stefanyszyn, Xi Tong, Yuhang Zhu2026-04-15

🔢 mathematics

On Geometric Spectral Functionals

This paper extends classical spectral functionals defined via the Wodzicki residue from torsion-free Dirac operators to geometries with torsion, demonstrating that their local densities recover fundamental geometric tensors and introducing novel chiral spectral invariants through a grading operator.

Arkadiusz Bochniak, Ludwik Dąbrowski, Andrzej Sitarz, Paweł Zalecki2026-04-15

⚛️ general relativity

Testing the Dark Universe through the Layzer-Irvine Equation

This paper reviews the cosmic generalization of the virial theorem, known as the Layzer-Irvine equation, examining its applications in dark matter-dark energy interaction models and alternative gravity theories while outlining future research directions.

Cláudio Gomes2026-04-15

⚛️ general relativity

Topological charge and black hole photon spheres in massive gravity

This paper investigates photon spheres in four-dimensional static and spherically symmetric black holes within dRGT massive gravity, revealing that while standard Einstein-like black holes possess a single unstable photon sphere, specific parameter regions allow for configurations with two or no photon spheres that exhibit distinct topological charges and stability properties compared to horizonless compact objects.

Pavan Kumar Yerra, Chandrasekhar Bhamidipati2026-04-15

⚛️ general relativity

On Scalar Cosmological Perturbations in Non-Minimally Coupled Weyl Connection Gravity

This paper investigates a non-minimally coupled Weyl connection gravity model that unifies gravity and electromagnetism while mimicking dark matter and energy, deriving its cosmological field equations and analyzing scalar perturbations alongside new black hole solutions featuring additional horizons.

M. Lima, C. Gomes2026-04-15

⚛️ high-energy theory

Covariant phase space and the semi-classical Einstein equation

This paper generalizes the covariant phase space formalism to semi-classical gravity by defining a semi-classical symplectic two-form as the sum of the gravitational symplectic form and the Berry curvature of the quantum matter state, demonstrating its slice independence and its duality to the Berry curvature in the boundary CFT within the AdS/CFT framework.

Abhirup Bhattacharya, Onkar Parrikar2026-04-15

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