4428 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 four-dimensional topological anti-de Sitter black holes in ModMax electrodynamics by establishing a distinct charge normalization, classifying extremal solutions across different horizon geometries, and applying classical stability diagnostics to clarify the model's limitations regarding the Weak Gravity Conjecture and other swampland criteria.
This paper demonstrates that singular Tolman–Oppenheimer–Volkoff fireholes with a radiation equation of state are radially unstable unless confined within a boundary radius approximately equal to their equilibrium size, as the unbounded configuration and open fireholes become unstable before reaching this critical threshold.
This paper demonstrates that a hierarchical inference strategy, which sequentially fits and subtracts Massive Black Hole Binaries before analyzing Extreme Mass Ratio Inspirals, effectively recovers astrophysical parameters with minimal bias in simulated LISA data containing multiple overlapping sources and noise.
This paper demonstrates that the first-order Goldberg-Palatini gravitational action can be uniquely reconstructed from Noether identities associated with diffeomorphism invariance by imposing polynomiality and dimensional constraints on a symmetric metric perturbation and trace-adjusted connection, thereby eliminating the ambiguity inherent in self-coupling approaches without requiring a predefined energy-momentum tensor.
This paper investigates two distinct mechanisms for regularizing the central singularity of Reissner--Nordström--de Sitter black holes: a thin-shell model matching a de Sitter interior to an exact exterior, which establishes specific stability conditions on the cosmological constants, and a modified density profile approach that uniquely fixes the smoothing scale, demonstrating that these methods yield fundamentally different spacetime geometries despite sharing the same asymptotic behavior.
This paper analyzes non-minimal unimodular inflation in the Einstein frame, deriving its exact analytical observables and demonstrating that while the model can reproduce acceptable CMB parameters at isolated field values, it fails to satisfy both scalar weak gravity conjectures and cannot simultaneously fulfill the refined de Sitter conjecture while supporting a complete 50–60 e-fold inflationary history.
This paper demonstrates that the axion dark energy model, characterized by a periodic scalar-field potential, is a dynamically consistent and observationally viable candidate for cosmic acceleration because its background evolution naturally transitions from saddle-point radiation and matter epochs to a stable dark energy attractor.
This paper forecasts that while a Gaia-like fast-spinning astrometric satellite falls short of detecting the stochastic gravitational-wave background in the microhertz gap, a larger 8-meter aperture or a satellite constellation could successfully bridge the frequency gap between pulsar timing arrays and LISA by leveraging high-cadence observations to maintain white noise floors at higher frequencies.
This paper presents a new set of hybrid star equations of state (SmallQ) that relaxes the requirement for maximum-mass neutron stars to have large quark cores, resulting in models with higher phase transition densities, smaller radii, and improved compatibility with NICER and GW190817 observations compared to previous constraints.
This paper introduces EMRICode, a flexible Python-based framework for simulating generic extreme mass-ratio inspirals in Kerr spacetime that combines adaptive geodesic integration with various radiation-reaction prescriptions to study orbital dynamics, including the evolution of the Carter constant and interactions with external environments like accretion disks.