⚛️ Category

gr-qc

3826 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.

⚛️ high-energy experiments

Cavity Multimodes as an Array for High-Frequency Gravitational Waves

This paper demonstrates that a single microwave cavity operating with a background magnetic field can function as a multi-mode detector array, enabling the localization and reconstruction of high-frequency gravitational wave properties—such as polarization and frequency drift—through the distinct antenna patterns of its nearly degenerate electromagnetic modes, thereby enhancing sensitivity to astrophysical sources.

Diego Blas, Yifan Chen, Yuxin Liu, Yanfei Shang, Jing Shu2026-07-03
⚛️ high-energy theory

Entire Four-Graviton EFT from the Duality Between Color and Kinematics

This paper generalizes the Bern-Carrasco-Johansson double-copy principle by enforcing color-kinematics duality on a complete basis of four-point color structures, thereby demonstrating that all parity-even four-graviton amplitudes in any dimension can be systematically constructed from gauge-theory building blocks, with the exception of the Lovelock R3R^3 term in D>6D>6 which requires a universal triple-copy.

John Joseph M. Carrasco, Sai Sasank Chava, Alex Edison, Eliseu Kloster, Suna Zekioğlu2026-07-03
⚛️ general relativity

Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during Inflation

This paper proposes that a transient violation of the null energy condition during inflation generates primordial black holes and a distinctive, multi-component stochastic gravitational wave background—encompassing primordial, scalar-induced, ringdown, and binary merger signals—that can be probed through future multi-band observations to constrain inflationary physics.

Dong-Hui Yu, Jia-Zuo Zhang, Yong Cai2026-07-03
⚛️ phenomenology

Can Primordial Black Holes Be Seeds for Early Galaxies in Models Satisfying the Covariant Entropy Bound?

This paper proposes a cosmological model satisfying the Covariant Entropy Bound where early-universe tiny black holes decay to generate the radiation-dominated era and CMB observations, while a distribution of larger primordial black holes and their Planck-scale remnants account for dark matter and the formation of early galaxies observed by the James Webb Space Telescope.

Sidan A, Tom Banks, Willy Fischler2026-07-03
⚛️ phenomenology

No Evidence for Superradiant Axions in LIGO-Virgo-KAGRA GWTC-5 Binary Black Hole Spins

Using spin measurements from the LIGO-Virgo-KAGRA GWTC-5 catalog of 257 binary black hole mergers, this study finds no evidence for superradiant axion clouds, thereby excluding axion masses between 1.7×10−141.7 \times 10^{-14} and 3.3×10−123.3 \times 10^{-12} eV at 95% confidence and providing one of the most robust lower bounds on the QCD axion mass to date.

Orion Ning, Benjamin R. Safdi, Catherine Welch2026-07-03
⚛️ general relativity

Impact of Spacecraft Orbit Uncertainties and Velocity Mismodeling on the LISA Gravitational-Wave Response

This study quantifies how uncertainties in spacecraft orbit determination and the neglect of velocity mismodeling affect the LISA gravitational-wave response, finding that while orbit uncertainties cause negligible errors at high frequencies, ignoring spacecraft velocities introduces mismatches of order 10−410^{-4} around 10−410^{-4} Hz that result in less than 1-σ\sigma biases in parameter estimation for high-SNR galactic binaries.

Lorenzo Speri, Olaf Hartwig, Waldemar Martens, Oliver Jennrich, Eric Joffre, Michele Armano, Martin Hewitson, Nora Lützg (…)2026-07-03
⚛️ general relativity

Stability regions of glued wormholes with massless Kim-Lee backreacted spacetimes as interior

This paper investigates the stability regions of traversable wormholes formed by gluing massless, backreacted Kim-Lee interior spacetimes (both scalar and electrically charged) to massive Schwarzschild and Reissner-Nordström exteriors via thin shells, demonstrating that despite the distinct physical nature of the interiors, the resulting stability conditions are remarkably similar.

G. F. Akhtaryanova, R. Kh. Karimov, R. N. Izmailov, A. Bhattacharya2026-07-03