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 provides a pedagogical 1+1-dimensional analysis of the relationships between cosmic time, conformal time, and the scale factor in a spatially flat Friedmann–Robertson–Walker universe, clarifying how these variables govern particle geodesics and spacetime curvature across radiation-dominated, matter-dominated, and de Sitter scenarios.
This paper demonstrates that the previously observed universal negativity of the equilateral bispectrum from massive scalar exchange during inflation is not a generic feature, but rather a consequence of restricted operator structures, as including additional EFT operators, reduced sound speed, or multi-particle exchanges can flip the bispectrum's sign to positive.
Using 3D hydrodynamical simulations, this paper demonstrates that the critical obliquity predicted by semi-analytic models for supermassive black-hole binaries corresponds to a disc-breaking phenomenon that disrupts the accretion disc and can compromise or prevent the alignment of black-hole spins with the orbital angular momentum.
This paper investigates the thermodynamic properties, stability, and Joule-Thomson expansion of static charged dilaton black holes in 2+1 dimensions within both canonical and grand canonical ensembles, revealing distinct stability regimes based on the coupling parameter and identifying a Hawking-Page phase transition for specific values.
This paper presents a coordinate- and spacetime-independent scalar-field solution within quantum field theory that unifies descriptions across various cosmological models, locally recovers standard Minkowski physics, and remains non-perturbative in strong gravitational fields.
This paper proves a global well-posedness and asymptotic convergence theorem for the -dimensional vacuum Einstein equations with a positive cosmological constant on globally hyperbolic spacetimes with negative Yamabe type manifolds, demonstrating that large initial data leads to solutions converging to a constant negative scalar curvature metric via a new integrable damping mechanism, thereby confirming Ringström's conjecture that such dynamics do not canonically encode the Thurston geometrization of the underlying three-manifold.
InflationEasy is a C++ lattice code that extends the capabilities of LATTICEEASY to simulate nonlinear scalar field dynamics in an expanding universe, enabling fully nonperturbative studies of inflationary regimes, primordial black hole formation, and scalar-induced gravitational waves through features like a nonperturbative method.
This paper investigates the index of marginally outer trapped surfaces (MOTS) representing cosmological horizons in Kerr-Newman-de Sitter spacetime, establishing that the index is at least one (and exactly one under specific mass bounds) and deriving an area-charge inequality for MOTS with index one under the dominant energy condition.
This paper presents a method to analytically construct a localized, five-dimensional rotating braneworld black hole that connects to an AdS boundary and reproduces the standard four-dimensional Kerr spacetime on the brane, supported by a non-diagonal anisotropic fluid in the bulk without requiring matter on the brane itself.
This paper reassesses the accuracy of the Dudley-Finley approximation for Kerr-Newman quasinormal modes by comparing it to full coupled calculations, revealing typical agreement within 10% for real frequencies and 1% for imaginary parts, while also deriving analytic boundaries for distinct near-extremal damping regimes and analyzing the trajectories of high-overtone modes.