2489 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.
Using quantum field theory of linearized gravity, the paper demonstrates that the Berry curvature of right- and left-handed gravitons induces a spin Hall effect in curved spacetime, resulting in a helicity-dependent energy current splitting that is exactly twice the magnitude of the corresponding effect for photons.
This paper investigates the scattering and absorption of charged massive scalar fields by a Reissner-Nordström black hole immersed in perfect fluid dark matter, revealing that increasing dark matter density significantly suppresses absorption while enhancing superradiant amplification compared to the standard Reissner-Nordström case.
This paper presents a recursive perturbative expansion of the Kerr black hole metric in harmonic gauge as a double series in Newton's constant and the spin parameter, detailing the challenges of re-summing the series into a closed form and addressing related dimensional regularization issues.
This paper argues that near the surface of an Exotic Compact Object, the vacuum Einstein equations induce chaotic metric oscillations analogous to cosmic billiards, where sign-changing potential walls cause compact directions to collapse into zero size, naturally transitioning the geometry into the interior of string theory fuzzballs.
Motivated by the observed accelerated expansion of the universe, this paper investigates whether gravitational radiation energy and its flux, treated as well-defined physical quantities within the teleparallel equivalent of general relativity and analyzed via the Bondi–Sachs framework, contribute to cosmic acceleration by leveraging the cumulative nature of gravitational radiation over long time scales and the non-positive-definite character of gravitational energy.
This study demonstrates that current gravitational-wave constraints on the Hubble constant () using spectral-siren cosmology remain robust against potential redshift evolution in the binary black hole mass spectrum, as no compelling evidence for such evolution was found and the resulting systematic uncertainty is subdominant to other modeling choices.
This paper introduces BHPTNRSur2dq1e3, a reduced-order surrogate model for gravitational waves from spinning, intermediate-to-large mass ratio binary black holes that combines point particle perturbation theory with numerical relativity calibration to accurately cover mass ratios from 3 to 1000, employing a domain decomposition strategy to handle retrograde spin complexities.
This paper utilizes effective field theory consistency relations to demonstrate that current constraints on the effective gravitational constant derived from gravitational wave observations are consistent with, and in the case of GW170817 comparable to, those obtained from large-scale structure surveys, thereby validating these independent probes of dark energy.
This paper presents updated constraints on axion early dark energy (AEDE) using CMB data from SPT, ACT, and Planck alongside DESI BAO measurements, revealing that while CMB data alone shows no significant evidence for AEDE, the inclusion of DESI data induces a mild preference for the model and significantly reduces the Hubble tension, a shift attributed to existing discrepancies between DESI and CMB datasets in the standard CDM model.
This paper proposes a viable Loop Quantum Cosmology model featuring a quasi-dust scalar field and an ekpyrotic field that together generate a matter-bounce with scale-invariant perturbations, suppress anisotropies, and produce a red-tilted power spectrum consistent with current observations.