2615 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.
This paper explores extending Bimetric MOND (BIMOND) to create variable- theories that naturally satisfy local constraints on the constancy of Newton's constant while allowing for a different, enhanced effective gravitational constant () in cosmological settings to potentially explain dark matter effects without new degrees of freedom.
This paper proposes a unified thermodynamic framework where cosmic acceleration emerges from an entropic force driven by a generalized mass-to-horizon scaling relation, and demonstrates through a comprehensive Bayesian analysis of multi-probe observational data that this entropic cosmology is statistically preferred over the standard CDM model.
This paper demonstrates that the chaos bound proposed in MSS can be violated in the spinor field of a Reissner-Nordström black hole by analyzing the orbital motions of both neutral and charged spinning particles, showing that sufficiently large spin magnitudes or specific spin-angular momentum alignments lead to Lyapunov exponents exceeding the surface gravity.
This paper derives a model-independent upper limit on the amplitude of a chiral gravitational wave background produced before the electroweak epoch, which, for high reheating temperatures, provides a significantly more stringent constraint than standard big bang nucleosynthesis bounds at frequencies above the MHz scale.
This paper reviews the analogue gravity description of unidirectional water waves in two-dimensional flows with constant shear, demonstrating that such flows can be effectively modeled by a curved spacetime metric without requiring prior knowledge of general relativity.
This paper introduces a novel search framework for precessing binary black hole systems in LIGO-Virgo-KAGRA data that utilizes mode-by-mode filtering, machine learning-based template reduction, and marginalization over harmonic signal-to-noise ratios to overcome the computational and statistical challenges of spin precession, ultimately increasing the sensitive search volume by approximately 10%.
This paper derives exact one-loop QED effective actions for scalar and spinor fields in global (anti-)de Sitter spacetime under a uniform electric field by utilizing the in-out formalism and Bogoliubov coefficients, revealing a strong interplay between electric fields and spacetime curvature while recovering known limits in pure (A)dS and Minkowski spaces.
This paper investigates the Cuscuton-Galileon model through Lie point symmetry and Killing analysis, revealing that the symmetry constraints eliminate the original Cuscuton term and restrict the potential to an exponential form, leading to a two-degree-of-freedom system that exhibits damped oscillatory cosmological behavior when a specific coefficient vanishes.
This paper demonstrates that negative dilaton hair in rotating Einstein-Maxwell-Dilaton-Axion black holes significantly enhances energy extraction efficiency and the rotational energy reservoir while expanding the parameter space for wave superradiance and preserving the Bañados-Silk-West divergence in particle collisions compared to standard Kerr black holes.
This paper utilizes the unitary irreducible representations of the infinite-dimensional asymptotic symmetry groups of QED and gravity to encode universal infrared features of scattering processes and explores the construction of an infrared-finite -matrix by studying supermomentum eigenstates in contrast to the dressed-state approach.