2489 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 heuristic paper extends the Laplace-Beltrami formalism, previously used to model gravitational wave energy from coalescing compact binaries, to a broader analysis of the Einstein field equations across zeroth, first, and second-order differential terms to evaluate its practicality and limitations in describing various general relativistic systems.
This paper utilizes the Eisenhart lift formalism within the Rosen-Lagrangian cosmology framework to derive analytic solutions to the Wheeler-DeWitt equation, thereby unifying geometrical methods, quantum cosmology, and dynamical dark energy models that generalize the standard CDM scenario.
This study utilizes general relativistic radiative transfer simulations to demonstrate that while both Ellis-Bronnikov wormholes and Schwarzschild black holes produce similar shadow and photon ring structures consistent with Event Horizon Telescope observations of M87*, the wormhole's lack of an event horizon results in a distinctly brighter shadow and ring due to emission from matter beyond the throat.
This paper utilizes the superfield formalism to demonstrate that color confinement in QCD arises from BRST-bound states that render gluons and quarks massive dipole fields, a mechanism the authors propose could similarly resolve the unitarity violation caused by massive ghosts in quadratic gravity.
This paper derives exact analytic quasi-stationary states for a massive scalar field in a dyonic Kerr-Sen black hole background using horizon-regular coordinates, revealing a quantized spectrum where positive-energy modes grow exponentially to destabilize the chronology-violating inner region, thereby supporting Hawking's chronology protection conjecture.
This paper clarifies and validates the correspondence between gravitational wave ringdown quasi-normal modes and black hole imaging observables (critical impact parameter and Lyapunov exponent) for various modified spherically symmetric black hole geometries, demonstrating that the relationship remains surprisingly accurate even at low multipole numbers.
This paper introduces a novel covariant framework for characterizing photon surfaces in dynamical spherical space-times, extending the analysis of unstable null geodesics beyond stationary scenarios to model complex astrophysical processes like stellar collapse, accretion, and evaporation.
This paper proposes a new model in loop quantum cosmology that incorporates a Lorentzian term representing spatial scalar curvature, resulting in effective dynamics that resolve the classical singularity via a quantum bounce at a significantly lower volume than standard LQC while preserving its key qualitative features.
This paper presents the first calculation of the stress-energy tensor for a quantized massive scalar field in thermal states on a zero-tidal-force wormhole, demonstrating that the Morris-Thorne conditions for a traversable wormhole are satisfied only when the field's mass lies within a specific bounded interval and its temperature remains below a corresponding mass-dependent critical threshold.
COSMOS is a standalone, OpenMP-parallelized C++ numerical relativity code designed to simulate primordial black hole formation by solving the Einstein equations in 3+1 dimensions using specialized non-Cartesian scale-up coordinates and fixed mesh refinement to handle non-linear gravitational dynamics.