3875 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 proposes a cosmological collider model where a standard inflaton interacts with ghost condensate spectator fields, leveraging their modified dispersion relation to weaken Boltzmann suppression and enhance primordial non-Gaussianity while remaining consistent with observational constraints.
This paper proposes a simple two-field inflation mechanism where a sharp transition between distinct energy scales induces rapid field turns that amplify fluctuations, potentially generating primordial black holes and secondary gravitational waves through a peak in the scalar power spectrum.
This paper systematically analyzes critical orbits of test particles across Schwarzschild, Reissner-Nordström, Kerr, and Kerr-Newman black hole backgrounds by deriving explicit parameter-radius relationships from radial equation root structures and exploring their connections to photon spheres and black hole shadows through extensive numerical results.
This paper establishes a unified geometric framework for the quantum-to-classical transition in the early universe by demonstrating that constraints on primordial perturbations, particularly the avoidance of gravitational non-linearities, definitively rule out decohered thermal states and limit amplitude-diagonal decoherence models to fewer than 70 e-folds of inflation.
This paper details significant enhancements to the PyCBC Live low-latency search pipeline for the LIGO-Virgo-KAGRA fourth observing run (O4), including improved background modeling, early warning capabilities, and glitch rejection, which collectively increased detection sensitivity and identification rates for compact binary mergers compared to the previous O3 configuration.
This paper defines a quasilocal mass of Bartnik type and proves that it is strictly positive for spacelike hypersurfaces containing apparent horizons and monotonically nondecreasing over time in associated evolutionary scenarios.
This paper demonstrates that while eternal inflation involves rare stochastic upward fluctuations of the inflaton, the resulting gravitational backreaction invalidates the background spacetime assumption long before the Smeared Null Energy Condition (SNEC) can be violated, thereby confirming that standard stochastic diffusion does not inherently breach this energy bound within the semiclassical slow-roll regime.
This paper demonstrates that three specific degenerate spacetime configurations with wormhole topology, derived from Rindler, Minkowski, and Schwarzschild metrics via branching coordinate transformations, represent matter-free physical states within the Einstein-Palatini-Cartan framework, thereby establishing degenerate geometries as an independent sector of general relativity distinct from non-degenerate wormholes that require exotic matter.
This paper presents an algebraic classification of four-dimensional warped product Einstein manifolds by constructing and relating two matrix representations of the curvature tensor, thereby determining their Petrov types and establishing topological restrictions in the half-conformally flat limit.
This paper proposes a new mechanism for the annihilation of cosmologically problematic domain walls attached to cosmic strings in global symmetry models, demonstrating that radiative corrections from small bare fermion masses can generate a temperature-dependent bias that triggers the network's decay, using a majoron framework with right-handed neutrinos as a representative example.