3826 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 establishes a thermodynamic dictionary linking black hole dynamics at null infinity to open quantum systems, demonstrating how non-thermal vacuum states enable work extraction and deriving generalized grand potential laws that incorporate grey body effects and angular momentum fluxes.
This paper establishes that while analytic nonlocal smearing can suppress gravitational-wave echoes in horizonless ultracompact objects under specific conditions involving weak scattering, slow background variation, and redshift-enhanced layer width, it does not universally eliminate echoes from all smooth horizonless geometries.
This paper investigates cyclic cosmology on an anisotropic Bianchi-I brane with a timelike extra dimension, demonstrating that while bounces and turnarounds are possible under specific high-energy conditions driven by a uniform-rate scalar field, sustaining a long, observationally viable cyclic phase requires the shear anisotropy to be suppressed by orders of magnitude, thereby highlighting a significant anisotropy problem in this framework.
This study investigates non-minimal coupling between dark matter and gravity using ultra-diffuse galaxies, finding that current kinematic data are consistent with General Relativity and only yield upper limits on the coupling strength, indicating that future high-precision measurements are required to detect such effects.
This paper proposes a complex scalar field inflation model with nonminimal coupling and a non-symmetric potential, demonstrating that while the imaginary sector's dissipative effects are negligible during slow roll, they naturally trigger efficient geometric reheating at the end of inflation, yielding predictions for the spectral index and tensor-to-scalar ratio that are fully consistent with Planck 2018 observations.
This paper proposes the Berry random wave hypothesis as a new diagnostic for chaos in BPS microstate geometries, revealing that while probe wave chaos intensifies with reduced supersymmetry and longer AdS throats, probe geodesic motion becomes more regular due to stable periodic orbits, a dichotomy not reflected in the Rényi entropies of dual CFT states.
This paper revises a previous analysis of Pantheon+ supernovae by correcting a coordinate error and applying progenitor-age adjustments, finding that the data remains consistent with an accelerating universe and the CDM model while refuting claims of cosmic deceleration or significant hemispheric anisotropy.
This paper investigates the construction and dynamics of transient, non-supersymmetric Glauber-Sudarshan states in four-dimensional diffeomorphism-invariant theories, demonstrating how they mimic quasi-de Sitter backgrounds and are constrained by a nontrivial bootstrap relation across canonical, path-integral, and Lefschetz-thimble formalisms, while revealing structural analogies to string theory vertex operators.
This paper refutes the hypothesis that the Universe maximizes entropy production by demonstrating that while supermassive black holes dominate total entropy, their actual growth rates remain orders of magnitude below the theoretical causal-hydrodynamic limits, indicating that cosmic structure formation is not driven by a maximum-entropy-production principle.
This paper investigates the behavior of massive scalar fields on rotating Kalb-Ramond black holes, demonstrating the separation of the Klein-Gordon equation, the existence of stationary scalar clouds and quasinormal modes in the near-extremal regime, and the derivation of tighter observational constraints on Lorentz-violating parameters by combining Event Horizon Telescope shadow bounds with the conditions required for scalar cloud formation.