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 presents a numerical framework using spectral-element simulations to estimate Newtonian noise for the Einstein Telescope, demonstrating its accuracy against analytical models and revealing that a lower P-wave fraction in homogeneous media suggests enhanced prospects for noise mitigation compared to previous assumptions.
This paper investigates non-Gaussian features in cosmological stochastic gravitational-wave backgrounds generated by second-order vector fluctuations, demonstrating that the resulting connected trispectrum scales with the square of the power spectrum, impacts the variance of pulsar timing array correlations, and provides a distinct observable to distinguish primordial from astrophysical sources.
This paper theoretically investigates strong gravitational lensing by a compact object in effective quantum gravity that lacks Cauchy horizons, finding that while horizonless wormhole solutions are ruled out by SgrA* observations, they remain consistent with M87* data, and providing estimates for potentially detectable lensing observables.
This study performs a phase space analysis of the Bianchi type III universe within three different gravity models, revealing that while all models reproduce the standard cosmological evolution sequence, only two are physically viable as the third model suffers from unbounded energy density issues.
This paper introduces a new four-dimensional rotating axionic AdS black hole solution coupled to a scalar field, derives its thermodynamic properties via the Euclidean procedure to verify the first law, and highlights its potential as a framework for studying holographic superconductors.
This study presents a comprehensive analysis of neutron star pressure anisotropy using multi-messenger observations and nuclear constraints, finding a population-wide preference for negative anisotropy driven by PSR J0740+6620 that, while not yet conclusive, highlights anisotropy as a valuable tool for uncovering missing or novel physics in neutron star modeling.
This paper investigates how the Gauss-Bonnet gravitational trace anomaly influences the orbital dynamics and quasi-periodic oscillations (QPOs) of test particles around black holes, demonstrating that the anomaly parameter causes deviations from the Schwarzschild case and successfully constrains black hole parameters using observational data and MCMC analysis within the relativistic precession (RP) model.
Using a chiral spin-chain simulator, the study demonstrates that while free quantum black hole models exhibit no genuine thermalization, Hawking radiation appears thermal only when observed through horizon bipartitions due to an apparent Fermi-Dirac distribution, with true thermal behavior emerging solely from interactions deep within the black hole interior.
This paper introduces a general method based on the transverse intersection of submanifolds in phase space to prove the non-degeneracy of the Hessian in spinfoam vertex amplitudes with a cosmological constant, thereby validating the stationary phase approximation for non-degenerate geometric 4-simplices in de Sitter or anti-de Sitter space and confirming the model's connection to semiclassical gravity without dominant exceptional contributions.
This paper provides a comprehensive classification of static spherical vacuum solutions in bumblebee gravity with general vacuum expectation values, revealing a parameter-dependent degeneracy that renders the non-minimally coupled theory ill-defined at and demonstrating that exact Schwarzschild solutions can coexist with non-zero matter distributions, thereby challenging the validity of current solar system experimental constraints.