2677 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 demonstrates that the absence of gravitational-wave echoes in diffeomorphism-invariant nonlocal quantum gravity is a structural consequence of the extreme blueshift near the horizon activating a nonlocal regulator that smears sharp reflecting surfaces into smooth transitions, thereby preventing the formation of the echo cavity rather than damping the wave frequencies.
This paper investigates the early-time quantum cosmological dynamics of a Friedmann–Lemaitre–Robertson–Walker universe within the gravity framework by employing Schutz's perfect fluid formalism to derive the Schrödinger–Wheeler–DeWitt equation and analyze the wave function of the universe, thereby highlighting the significant role of matter-geometry coupling in cosmic evolution.
This paper proposes a unified formation pathway for highly asymmetric mass-ratio gravitational wave events like GW190814 and the Galactic high-mass X-ray binary 4U 1700-37, demonstrating that such systems originate from conservative mass transfer and specific natal kicks, thereby using local HMXB analogs to bridge the gap between observed stellar binaries and gravitational wave sources.
This paper formulates Lazarides-Shafi axion models as Dijkgraaf-Witten topological quantum field theories to derive a master formula for the domain wall number and clarify how higher-form symmetries and higher-group structures enable vacuum identification, revealing that even domain-wall-number-one scenarios exhibit nontrivial four-group structures and symmetry-protected topological phases.
This paper evaluates the validity of assuming uncorrelated time chunks and frequency bins in stochastic gravitational-wave background searches, quantifying the resulting parameter inference errors from time-frequency averaging using Fisher information and addressing optimal strategies for locally stationary processes.
This paper provides a self-contained, geometrically grounded introduction to BMS group theory in any dimension by defining BMS transformations as conformal Carrollian isometries at null infinity, exploring their semidirect structure, and detailing their relationship to Minkowski spacetime reconstruction, Poincaré subgroups, and unitary representations without relying on traditional bulk realizations.
This paper constructs initial data for the Einstein equations that extend specific Bartnik data to spherically symmetric Schwarzschild spacetimes and connects them to time-symmetric data on a cylinder, thereby enabling the derivation of Bartnik mass estimates in non-time-symmetric settings.
This paper presents and analyzes charged traversable wormhole solutions supported by anisotropic matter fields, confirming their physical viability through flare-out conditions, tidal force evaluations, and light deflection studies, while also constructing rotating generalizations to demonstrate a concrete realization of the "charge without charge" concept.
This paper demonstrates that self-interacting SU(2) vector fields minimally coupled to gravity in a 1+1 't Hooft-Polyakov monopole configuration avoid the well-posedness instabilities found in Abelian theories, enabling stable numerical evolutions with characteristic speeds identical to general relativity.
This paper proposes a non-commutative fluid model derived from Newtonian cosmology, where a new parameter arising from deformed Poisson brackets acts as an intrinsic driver for the universe's accelerated expansion, offering a viable alternative to dark energy that is consistent with current observational data including DESI.