2979 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 rigorously establishes that dynamical quantum non-locality originates from the superposition principle by proving that the Wigner propagator reduces to its classical counterpart if and only if the Hamiltonian is at most quadratic, and introduces a measurable signed divergence that unifies the understanding of five distinct quantum phenomena ranging from non-local games to metrological gains.
This paper generalizes the description of primordial gravitational waves from a two-mode to a three-mode Bogoliubov transformation, revealing that while large squeezing can render the universe classical if only two modes are considered, the full three-mode analysis preserves quantum characteristics via the quantum Poincaré sphere for any non-zero squeezing or non-zero coherent state components.
This paper proposes a mechanism where axion-like particles coupled to the Nieh-Yan term generate a chiral gravitational wave background through tachyonic instability during the radiation-dominated era, offering a new avenue for detecting these particles via pulsar timing arrays and space-based observatories.
This paper resolves corner ambiguities in the gravitational boundary action at null infinity by constraining it to reproduce tree-level 5-point eikonal amplitudes, thereby naturally deriving the subleading soft graviton theorem and proposing an infinite tower of Goldstone modes via a generalized Geroch tensor to account for higher-order soft insertions and tree-level symmetries.
The paper introduces FIREFLY, a practical Bayesian algorithm that accelerates gravitational-wave ringdown analysis with multiple quasi-normal modes by analytically marginalizing amplitude and phase parameters, thereby reducing computational time from hours to minutes while maintaining statistical rigor.
This paper presents a hybrid numerical analysis demonstrating that the collision of sound shells generated by large primordial density perturbations produces a stochastic gravitational wave background with detectable signatures for future observatories, offering new constraints on primordial black holes even after they have evaporated.
This paper constructs a class of regular black hole geometries by prescribing finite curvature invariants via Ricci and Weyl scalars, demonstrating that the stability of these singularity-free solutions under axial gravitational perturbations critically depends on the shape and peak-to-valley ratio of the resulting effective potential.
This paper presents new exact charged black hole solutions in (2+1)-dimensional gravity using a cubic non-metricity model, revealing novel asymptotically Anti-de Sitter configurations that lack General Relativity counterparts, while analyzing their unique horizon structures, softened singularities, thermodynamic stability, and orbital dynamics.
This paper initiates the study of spherically symmetric spacetimes in second-order effective gravitational theories by proving the existence of regular Vaidya solutions that describe the dynamical formation and evolution of regular black holes without curvature singularities, demonstrating how modified gravity can facilitate energy transfer between matter and gravitational degrees of freedom to resolve singularities.
This paper demonstrates that Hamilton-Jacobi theory, when applied with appropriate solution branches, successfully describes gauge-invariant scalar perturbations transitioning from slow-roll to ultra-slow-roll inflation, revealing that the limit is unphysical for asymptotic long-wavelength solutions and refining the understanding of stochastic equations in such regimes.