2593 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.
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.
This paper constructs a generalized class of Joshi-Malafarina-Narayan naked singularity models with radially dependent mass functions and non-vanishing tangential pressure, demonstrating that while accretion disk spectra exhibit enhanced high-frequency emission, the resulting shadow remains indistinguishable from a Schwarzschild black hole when the photon sphere lies in the exterior region, thereby confirming the robustness of JMN-type geometries as small perturbations.
This paper investigates how non-local gravity models, reduced to scalar-tensor theories via Noether symmetries, can simultaneously explain the high-energy astrophysical neutrino fluxes observed by IceCube/KM3NeT and the cosmological abundance of dark matter through a specific four-dimensional operator.
This paper examines the collapse of an isolated dust cloud using expansion functions to demonstrate that an apparent horizon exists and covers the gravitational singularity in regions far from it, though the method's applicability is limited near the singularity where quantum effects become significant.