4035 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 study proposes that self-bound hybrid stars characterized by strong phase transitions and large density discontinuities can simultaneously resolve multiple observational tensions regarding the masses, radii, and tidal deformabilities of various compact objects, including anomalous low-mass pulsars, the massive GW190814 secondary, and standard NICER measurements.
This paper investigates the gravimagnetic dipole spacetime formed by two counter-rotating black holes in equilibrium via a tensionless Misner string, deriving the velocities of circular rotation trajectories for both massive and massless particles along their geodesics.
This paper demonstrates that solitonic boson stars with positive binding energy can remain dynamically stable against nonlinear radial perturbations, thereby challenging the conventional view that negative binding energy is a necessary condition for the stability of such compact objects.
This paper introduces a protocol for harvesting quantum contextuality from the vacuum of a massless scalar field using Unruh-DeWitt detectors, demonstrating that gapless systems can extract this resource, revealing tradeoffs between harvested contextuality and entanglement, and establishing new criteria and measures for genuine harvesting across various quantum resources.
This paper demonstrates that causal bulk-viscous fluids, described by the Israel--Stewart formulation, provide a physically consistent mechanism for realizing non-singular cosmological bounces across General Relativity, gravity, and Loop Quantum Cosmology by enabling controlled null energy condition violations while ensuring positive entropy production and stable perturbations.
This paper investigates accretion columns in ultraluminous X-ray pulsars under the strangeon-star model, demonstrating that thermal mounds at the column base can generate significant neutrino emission via electron-positron annihilation, thereby offering a novel potential probe to distinguish between neutron stars and strange stars.
This paper establishes a coordinate- and foliation-invariant Heisenberg-type uncertainty principle for sharp position measurements on spacelike hypersurfaces in general relativity, demonstrating that strict confinement to a geodesic ball of radius enforces a momentum uncertainty lower bound of derived from the spectral geometry of the manifold.
This paper presents a parametric study of charged black holes in Weyl conformal gravity, deriving analytic expressions for horizons and photon spheres to reveal exotic spacetime structures—such as nested black holes with trapped Cauchy horizons and triple-horizon collisions—that arise due to the absence of the inverse quadratic term and differ fundamentally from standard general relativity.
This paper challenges the notion that extremal black holes are inherently unstable amplifiers of new physics by demonstrating that perturbed extremal Reissner--Nordström AdS black holes can possess regular, non-spherical horizons where scalar stress-energy divergences do not prevent finite backreaction and smooth geodesic crossing.
This paper presents the results of gravitational-wave lensing searches using data from the first part of the fourth LIGO-Virgo-KAGRA observing run (O4a), finding no conclusive evidence for strongly lensed events while constraining the rate of such events and highlighting one potential outlier, GW231123_135430, that requires further investigation due to waveform uncertainties.