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 introduces GP15, a deep-learning method that combines residual networks and normalizing flows to rapidly estimate binary black hole parameters from time-frequency spectrograms, demonstrating strong agreement with LIGO-Virgo-KAGRA results while generating posterior samples in seconds.
This paper applies and refines a statistical dispersion metric to establish robust thresholds for distinguishing between dynamical friction from dark matter spikes and various modified gravity theories (including extra dimensions and varying ) in future space-borne gravitational wave observations of massive black-hole binaries.
This paper investigates quasinormal modes and gravitational wave echoes in symmetric and asymmetric black bounce solutions, revealing that while symmetric horizonless configurations exhibit multiple potential barriers and distinct echoes, asymmetric models closely resemble standard Reissner-Nordström black holes without producing echoes, thereby making them difficult to distinguish observationally.
By applying the generalized second law to the apparent horizon of a homogeneous and isotropic universe with an equation of state no less than $-1$, the paper demonstrates that flat and closed universes are consistent with the dominant energy condition, whereas hyperbolic universes are not.
This paper investigates how shear viscosity in the post-inflationary universe modifies the propagation of primordial gravitational waves, demonstrating that viscosity induces additional damping and spectral running—such as a blue tilt from freeze-out in the electron-photon-baryon plasma—thereby altering the gravitational wave energy density spectrum by approximately .
This paper analyzes a nonminimally coupled curvature-matter gravity model that yields dynamical dark energy, demonstrating that its parameters can simultaneously satisfy cosmological constraints from DESI, Pantheon+, and Dark Energy Survey data while remaining consistent with lunar laser ranging limits on the equivalence principle.
This paper utilizes the heat kernel technique to demonstrate that specific ghost-free, infinite derivative gravity theories with generic form factors can completely cancel one-loop ultraviolet logarithmic divergences in four dimensions, thereby identifying conditions for renormalizability and providing general expressions for beta functions.
Using symplectic model order reduction, this paper demonstrates that the minimal number of canonical degrees of freedom required to describe the Hamiltonian evolution of a regularised scalar field scales with the area of the region rather than its volume, a phenomenon driven by the count of distinct normal-mode frequencies and observed in both flat and curved spacetimes as well as weakly interacting theories.
This paper presents a fully covariant and gauge-invariant formulation of electromagnetic wave propagation in static black hole spacetimes that reduces both axial and polar sectors to a unified master equation, enabling the derivation of a closed-form, position- and frequency-dependent effective refractive index in Schwarzschild geometry to provide an intuitive optical framework for analyzing gravitational effects on wave dynamics.
This paper presents a radiative post-processing framework for relativistic hydrodynamics simulations of black hole-disk collisions, revealing that the resulting luminous flares are primarily driven by super-Eddington accretion onto the secondary black hole rather than ejecta cooling, with their brightness and spectral evolution strongly dependent on collision velocity and disk density.