3285 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 investigates -gravity with matter-gravity coupling and a noncoincident connection as a geometric dark energy candidate, finding that the power-law model with is consistent with observational data and statistically equivalent to the CDM model.
Inspired by the MacDowell-Mansouri formulation of General Relativity, this paper investigates a gauge-theoretic functional derived from the Pontryagin density of an SU(3) connection broken to U(2), demonstrating that its critical points correspond to constant scalar curvature almost-Kähler 4-manifolds, which become Kähler-Einstein under specific compactness and curvature conditions.
This paper investigates scalar quantum fields in cosmological backgrounds with modified dispersion relations, establishing that while superluminal modifications preserve unitary equivalence, asymptotically subluminal behaviors can lead to inequivalent quantizations, and demonstrating that the ultraviolet scaling of the frequency uniquely determines the necessary subtraction order in adiabatic regularization.
This paper identifies an exceptional point in the quasinormal mode spectrum of hairy black holes within Einstein-Maxwell-scalar theory and demonstrates that a resonant ansatz featuring a linear time term provides a more robust description of ringdown signals at this degeneracy than the standard superposition of independent damped modes.
This paper investigates a cosmological scenario where mini primordial black holes, formed during a stiff fluid domination phase in runaway inflation models, evaporate to reheat the early universe, while also predicting a compound gravitational wave signal, potential dark energy contributions, and the existence of PBH remnants.
This paper introduces Scale Factorized-Quantum Field Theory (SF-QFT), a novel framework that eliminates renormalization ambiguities in QCD and QED by factorizing momentum modes and employing Effective Dynamical Renormalization with Principle of Observable Effective Matching constraints to produce scale-invariant observables and high-precision predictions with significantly reduced computational complexity compared to conventional methods.
This paper investigates the fermionic relative entropy in two-dimensional Rindler spacetime by comparing modular theory with reduced one-particle density operators, deriving a general formula for Gaussian states, and applying it to compute the entropy for non-unitary excitations.
This paper demonstrates that in Einstein-Cartan-Palatini gravity, coupling a pseudoscalar inflaton to the Nieh-Yan topological invariant generates torsion that effectively enhances the axion decay constant, thereby enabling sub-Planckian natural inflation models like the squared quartic hilltop potential to remain consistent with Planck 2018 observations while producing a chiral gravitational wave spectrum.
This paper demonstrates the cosmological viability of anisotropic inflation in Thurston spacetimes by showing that the intrinsic eccentricity of these geometries induces a vector field that triggers a stable, anisotropic inflationary phase, thereby establishing a unique, stable fixed point similar to those found in Bianchi models.
This paper constructs exact dyonic Reissner-Nordström-like and Taub-NUT-like black hole solutions in four and higher dimensions within Einstein-bumblebee gravity, analyzes their thermodynamic properties using the Wald formalism to establish the first law, and explores their generalizations to various topological horizons.