2520 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 for flat minisuperspace models with closed Universes, a specific class of operator orderings in the Wheeler-DeWitt equation, which are uniquely determined by path-integral measures and correspond to field redefinition Jacobians, yields physically equivalent quantum theories with identical observables and positive definite inner products.
This paper introduces and analyzes a novel finite-time pseudo-rip (FTPR) cosmological singularity, characterized by a preceding super-accelerated phantom phase and violations of all energy conditions, which is shown to be a weak singularity that can be incorporated into a model mimicking the past expansion history of the standard CDM universe.
This paper investigates the observable signatures of static, spherically symmetric wormholes with arbitrary throat profiles, demonstrating that while their shadow and silhouette radii can mimic those of a Schwarzschild black hole, their accretion disk images are distinctly brighter due to the dominant role of the Doppler effect over gravitational redshift.
This paper investigates the geodesic structure, black hole shadow, and Hawking sparsity of a static, spherically symmetric black hole sourced by a Kalb-Ramond field coupled to nonlinear electrodynamics, demonstrating that the combined effects of the field and magnetic charge significantly increase the sparsity of the Hawking cascade while maintaining consistency with Event Horizon Telescope observations of M87* and Sgr A*.
This paper analytically demonstrates that the convergence region of the Schwarzschild quasinormal mode expansion is determined by a geometric "bouncing singularity" in the complex time plane, caused by a null geodesic reflecting off the black hole singularity, which explains the observed bounds on real-time convergence and the annular convergence of Matsubara mode sums.
This paper establishes a general framework for Kerr-anti-de Sitter black hole thermodynamics that reconciles geometric and quantum-statistical considerations, demonstrating that observer-dependent kinematic quantities and gauge-fixed dynamical terms restrict the infinite family of thermodynamic descriptions to a unique, physically consistent subclass.
This paper computes second-order quantum corrections to cosmic perturbations in Loop Quantum Cosmology, deriving a Planck-suppressed scale-dependent enhancement to the curvature power spectrum and revealing that while gravitational quantum moments dampen scalar perturbations after the bounce, cross-sector correlations introduce ultraviolet instabilities that signal the limits of the second-order truncation.
This study demonstrates that non-canonical chaotic inflation models with potential indices , , and $1$ can be revived within the confidence intervals of high-precision cosmological data (ACT DR6 and BICEP/Keck) by establishing tight physical bounds on the non-canonical parameter and confirming a natural convergence to approximately 54 -foldings.
This paper investigates static electromagnetic and gravitational perturbations of five-dimensional Myers-Perry black holes, demonstrating that while the electric polarization reduces to a massless scalar field, the magnetic and gravitational sectors yield special Heun equations with exact hypergeometric solutions that reveal a non-trivial mixing of angular momentum modes in the static tidal Love tensors.
This paper proposes a new fundamental mechanism where the optical Magnus effect, through helicity-dependent transverse shifts in gravitational lensing, induces circular polarization in the cosmic microwave background from temperature fluctuations, although the resulting signal remains far below current detection capabilities.