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.
This paper introduces a new class of covariant interacting dark sector models where intrinsic entropy couples to a dark energy scalar field, resulting in a background cosmology indistinguishable from CDM while generating unique, scale-dependent signatures in linear perturbations that remain compatible with current CMB constraints.
This paper derives a complete second-order kinetic theory for cosmological magnetogenesis, identifying a new density-gradient source that significantly enhances the Thomson-scattering mechanism and demonstrating that the Harrison bulk-flow mechanism dominates under specific conditions, with all resulting seed fields exceeding the galactic dynamo threshold.
This paper establishes that for a dynamical black hole under second-order perturbations, the entropy is precisely given by the area of the apparent horizon and satisfies the second law of thermodynamics when the null energy condition holds, utilizing a modified canonical energy within the covariant phase space formalism.
This paper numerically demonstrates that the Einstein-de Sitter spacetime is non-linearly stable under small, generic perturbations when modeled with a polytropic fluid, contrasting with its known instability under dust and revealing a new stable regime in cosmological models.
This paper derives analytic templates for scalar and tensor power spectra in curved-space inflation transitioning from kinetic dominance to slow-roll, while demonstrating that curvature-assisted single-exponential models in open universes fall outside this framework due to their second Hubble slow-roll parameter remaining of order one.
This paper presents a detection method combining Linear Prediction Filtering and Matched-Filtering to identify gravitational wave memory from Galactic core-collapse supernovae, demonstrating that while the approach can detect signals from progenitors like D9.6-3D at 1 kpc, it remains insufficient for distances of 10–100 kpc, a conclusion reinforced after correcting an error that had previously underestimated neutrino-induced waveforms.
This paper presents new exact spacetime solutions for spiral galaxies that yield asymptotically flat rotation curves through anisotropic pressure, offering non-ideal generalizations of dust and radiation, a dynamical realization of the Einstein cluster, and a predicted correction to the Einsteinian light-bending angle.
This paper argues that the ontology of relational observables in General Relativity admits two equally precise interpretations—the "View from Nowhere," which posits a shared frame-free reality underlying partial perspectives, and the "View from Everywhere," which treats each relational description as a comprehensive reality without a shared substrate—while demonstrating that a frame-independent translation map can structurally connect these perspectives to counter objections against strong perspectivalism.
This paper presents corrected low-frequency gravitational wave signals from three-dimensional core-collapse supernova models, addressing a computational error that underestimated neutrino-induced waveforms by a factor of while confirming that the original conclusions remain valid and are further reinforced.
This paper proposes a novel Weyl gravity-based inflationary scenario where quadratic curvature and exponential extensions naturally produce a scalar spectral index of , bringing theoretical predictions into excellent agreement with the strict constraints from recent ACT and SPT observations.