3949 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 demonstrates that the presence of astrophysical foregrounds and strong primordial non-Gaussianity significantly weakens the link between scalar-induced gravitational waves and primordial black hole abundance, thereby limiting LISA's ability to definitively confirm or rule out asteroid-mass primordial black holes as dark matter.
This paper generalizes a quantum description of black hole dust cores from spherical symmetry to rotating geometries by quantizing dust particle geodesic motion to determine the many-body ground state, revealing how angular momentum influences the core's size and effective interior geometry.
This paper presents the first fully analytic construction of a stable, finite-thickness gravastar within the Shtanov-Sahni braneworld scenario featuring a timelike extra dimension, demonstrating that bulk Weyl corrections and negative brane tension naturally regularize the interior geometry to avoid singularities without relying on idealized thin-shell approximations.
Using high-resolution GRMHD simulations, this study demonstrates that density and magnetic field inhomogeneities in accretion flows around Kerr black holes generate steeper power spectra, longer correlation times, and larger coherent structures compared to unperturbed cases, offering new insights into interpreting Event Horizon Telescope observations of supermassive black holes.
This paper demonstrates that relativistic accretion disk spectra from the AGN MCG-06-30-15 exhibit a significant degeneracy between spinning Kerr black holes and non-spinning JMN-1 naked singularities, potentially leading to incorrect spin measurements and highlighting the need for independent spin constraints to distinguish between these collapsed objects.
This design report outlines the revised Advanced Virgo Plus (AdV+) upgrade strategy for the O5 observing run, which integrates stable recycling cavities, a modified central interferometer layout, and comprehensive subsystem renewals to overcome previous stability limitations and significantly enhance detector sensitivity and astrophysical reach.
This study investigates the equilibrium structure of white dwarfs within the quadratic gravity framework, demonstrating that positive nonmetricity corrections reduce the maximum stellar mass below the Chandrasekhar limit while yielding configurations consistent with the observed properties of the ultra-massive white dwarf ZTF J1901+1458.
This study utilizes the B-POP semi-analytic code to model binary black hole formation through both isolated evolution and dynamical interactions, demonstrating that a combined framework can reproduce observed merger rates and properties while highlighting the significant astrophysical complexities that currently hinder definitive conclusions about the origins of specific gravitational-wave events.
This paper demonstrates that the inherent ambiguity in matter-source interpretations (specifically between anisotropic fluids and nonlinear electrodynamics coupled to a scalar field) in Simpson-Visser spacetimes leaves distinct, branch-dependent imprints on gravitational ringdown waveforms, thereby offering a novel pathway to break this degeneracy through gravitational-wave spectroscopy.
This paper demonstrates that while Event Horizon Telescope observations provide tight constraints on the parameters of Culetu, Bardeen, and Hayward regular black holes, breaking the degeneracy among their microscopic cores requires analyzing high-order signatures like Lyapunov exponents and the inversion of brightness hierarchies in accretion flows, as standard geometric observables remain insufficient for distinguishing these non-singular geometries.