⚛️ Category

gr-qc

3875 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.

⚛️ phenomenology

Are Primordial Black Holes a Natural Dark Matter Candidate?

This paper challenges the prevailing view that Primordial Black Holes (PBHs) are generically fine-tuned dark matter candidates by demonstrating that, when evaluated across a broad landscape of production mechanisms and compared to particle dark matter benchmarks using uniform naturalness measures, PBHs span a full spectrum of naturalness tiers ranging from as natural as standard WIMPs to severely tuned, thereby proving that dismissing them as a whole conflates worst-case scenarios with a diverse landscape of viable models.

Stefano Profumo2026-06-12
⚛️ general relativity

Strong deflection limit-analysis using Picard-Fuchs equation in Einstein-Maxwell-Dilaton spacetime

This paper analyzes the strong deflection limit of light by charged black holes in Einstein-Maxwell-Dilaton spacetime by demonstrating that the deflection angle satisfies Picard-Fuchs equations, which are then solved using the integrability of Painlevé VI systems to uniquely determine the logarithmic expansion coefficients aˉ\bar{a} and bˉ\bar{b} consistent with the Schwarzschild limit.

Tadashi Sasaki2026-06-12
⚛️ high-energy theory

Quantum Gravity Induced Entanglement from Propagating Gravitons

This paper demonstrates that propagating quantized gravitons can induce entanglement between two massive particles in a harmonic oscillator potential through their commutation relations, establishing that this entanglement arises from quantum gravitational effects with a causal time delay proportional to the distance between the particles, which can be slightly enhanced using squeezed initial states.

Anom Trenggana, Freddy P. Zen2026-06-12
⚛️ general relativity

Solar-System Bounds on Ricci-flat Spindle Deformations of Schwarzschild

This paper establishes stringent Solar-System constraints on a new class of Ricci-flat spindle deformations of the Schwarzschild metric by demonstrating that the deformation parameter BB must be extremely small (∣B∣≲10−24–10−23 cm−1|B| \lesssim 10^{-24}\text{--}10^{-23}\ {\rm cm}^{-1}) to remain consistent with observed planetary perihelion precessions and Cassini light travel time measurements.

Zhong-Xi Yu, Hong-Da Lyu, Shoulong Li2026-06-12
⚛️ general relativity

Bounds on Λ\Lambda at the Galactic Center

This paper uses Bayesian analysis of astrometric and spectroscopic data from the S2, S1, and S14 stars orbiting Sgr A* to constrain the cosmological constant Λ\Lambda at the Galactic Center, establishing upper bounds of Λ≲6.9×10−48m−2\Lambda \lesssim 6.9\times10^{-48} \mathrm{m}^{-2} at 68% credibility and Λ≲1.0×10−38m−2\Lambda \lesssim 1.0\times10^{-38} \mathrm{m}^{-2} at 95% credibility.

Prajwal Hassan Puttasiddappa, Muzammil Mushtaq, Willian Ramirez, David F. Mota2026-06-12
⚛️ nuclear theory

Classification of Compact Stars via Machine Learning and Neural Network Models

This paper demonstrates that machine learning and deep learning models can accurately classify compact stars as neutron stars or quark stars based on observable macroscopic properties like mass, radius, and tidal deformability, offering a promising tool for probing dense matter composition while noting the need for further validation with hybrid and exotic matter scenarios.

D. Neraki, G. Koufetidis, I. Stergakis, Th. Diakonidis, Ch. C. Moustakidis2026-06-12
⚛️ high-energy theory

Logarithmic corrections to the entropy of near-extremal black holes in New Massive Gravity

This paper calculates the one-loop logarithmic corrections to the entropy of near-extremal black holes in New Massive Gravity by analyzing boundary graviton modes in the near-horizon AdS2×S1_2\times S^1 geometry, thereby extending recent General Relativity results to higher-curvature theories.

Lucas Acito, Mariano Chernicoff, Julio Oliva, Cielo Ramirez de Arellano Torres, Matías Sempe2026-06-12