2593 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 proposes that non-minimal coupling between a massive scalar field (potentially constituting dark matter) and the Ricci scalar induces tachyonic instabilities and scalarization in neutron stars, enabling them to support maximum masses exceeding even when the equation of state is softened by the presence of hyperons.
The paper introduces CosmoDS, a Python toolkit integrated with the Cobaya framework that enables the study and statistical constraining of cosmological models, particularly those involving dark energy, through dynamical system analysis at the background level.
This paper investigates primordial non-Gaussianity within the "Inflation without an Inflaton" framework, finding that while the mechanism intrinsically produces a bispectrum enhanced in squeezed configurations, its amplitude is so strongly suppressed by observational constraints on the scalar power spectrum that the resulting non-Gaussianity at CMB scales is negligibly small.
This paper demonstrates that the luminosity-temperature relation of low-mass galaxy clusters serves as a robust diagnostic tool for distinguishing modified gravity theories from standard CDM, as MG models predict distinct, non-mimicable steeper slopes in this relation that align significantly better with observational data than general relativity.
This paper investigates how CET Omega, an informational extension of quantum field theory, introduces a doubly logarithmic correction to the early-Universe radiation density that modifies WIMP freeze-out dynamics, thereby offering a consistent explanation for a tentative 20 GeV gamma-ray excess while remaining compatible with current cosmological constraints.
This paper demonstrates that Calabi-Yau and complete elliptic integrals do not contribute to conservative gravitational scattering observables at the fifth post-Minkowskian order because the specific ultraviolet singular structures required to generate the necessary logarithmic terms are absent in the classical limit.
This paper demonstrates that specific one-parameter dark energy models featuring phantom behavior at high redshift and crossing the barrier at lower redshift can resolve the CDM anomaly of negative neutrino mass sums, suggesting that the data favor distinct physical characteristics over broad parameter degeneracies.
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.