2677 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.
The paper argues that spacetime singularities should be viewed as formal indicators of model incompleteness rather than ontological entities, a position supported by a novel distinction between physical and formal assumptions and a comparison with Gödel's incompleteness theorem.
This paper proposes a non-singular, cyclic cosmological model where uniform-rate inflation occurs on an anisotropic braneworld with a timelike extra dimension, effectively resolving the initial singularity through smooth bounces while remaining consistent with observational data.
This paper presents the first exact neutral black-hole solutions in Entangled Relativity by describing a Schwarzschild black-hole immersed in a Melvin-like electric or magnetic background, demonstrating that these solutions recover General Relativity's Schwarzschild limit and suggest astrophysical black-holes in this theory are observationally indistinguishable from those in General Relativity due to weak interstellar matter fields.
This paper proposes efficient reheating mechanisms for the universe following supercooled phase transitions in theories with radiative symmetry breaking, detailing how the process depends on the symmetry breaking scale and demonstrating that such scenarios can simultaneously generate the observed dark matter abundance and primordial black holes.
This paper investigates a gravitational baryogenesis mechanism within gravity's rainbow, demonstrating how energy-dependent spacetime modifications and specific rainbow functions enable the generation of viable baryon asymmetry consistent with observational data through power-law cosmological solutions.
This paper presents the first Bayesian search for continuous picohertz gravitational waves using the drifts of pulsar binary orbital and spin periods, achieving a tenfold sensitivity improvement over previous efforts and demonstrating that future Square Kilometre Array observations will be capable of detecting signals from supermassive black hole mergers and probing new physics.
This paper employs a 2-dimensional theory space analysis (- plane) to demonstrate that gravity models capable of exactly mimicking CDM expansion histories are prone to instability, while those accommodating phantom crossing scenarios inevitably suffer from tachyonic instability, all without requiring explicit functional reconstruction of the gravity theory.
This paper investigates the potential of using upcoming upgraded LIGO-Virgo-KAGRA (LVK) observations to perform strong lensing cosmography by incorporating detector selection effects, demonstrating that even a modest number of lensed binary-black-hole detections can yield cosmological constraints while confirming that previous forecasts for next-generation detectors remain valid.
This paper employs dynamical systems methods to demonstrate how cosmological relaxation in a string-inspired dilaton model drives the universe toward a least-coupling fixed point, thereby naturally suppressing deviations from the equivalence principle through a global mechanism distinct from local environmental screening.
This paper investigates whether superluminal photon propagation in the Drummond-Hathrell effective action violates causality in curved spacetime by applying global causal structure analysis and quantum-field-theoretic microcausality diagnostics, concluding that such propagation remains causally benign within the theory's regime of validity for specific gravitational backgrounds.