3919 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 employs dynamical systems analysis to demonstrate that a non-canonical generalised Brans-Dicke theory with non-minimal coupling can reproduce CDM background characteristics for constant, power-law, and exponential potentials, while exhibiting distinct dynamical behaviors compared to other scalar-tensor models.
This work demonstrates that employing a fully covariant formalism to account for previously overlooked gauge dependencies reveals that the formation of primordial black holes and scalar-induced gravitational waves from first-order phase transitions is strongly suppressed, thereby calling into question their suitability as an explanation for the recent signals from pulsar timing arrays.
This paper presents a hierarchical Bayesian inference framework that utilizes a neural network emulator to accelerate detectability calculations by over six orders of magnitude, enabling robust constraints on extreme mass-ratio inspiral population parameters and massive black hole evolution using future LISA data.
This paper introduces a physical field-vanishing boundary condition for Reissner-Nordström-AdS black holes that enforces the vanishing of both metric and electromagnetic field-strength perturbations at the AdS boundary, leading to the derivation of specific Dirichlet and Robin conditions for master functions and the identification of new spectral features in quasinormal modes.
This paper establishes an identification between the phase space of the soft sector in four-dimensional asymptotically flat gravity and that of a spherically symmetric finite causal diamond in Minkowski spacetime, demonstrating that the leading soft graviton mode corresponds to the radial fluctuation of the diamond's size while the Goldstone mode encompasses both this fluctuation and its symplectic partner.
This paper demonstrates that the proposed Lunar Gravitational-Wave Antenna (LGWA) would significantly advance gravitational-wave astronomy by detecting a substantial fraction of known binary black hole events, enabling systematic multiband observations with ground-based detectors, and providing precise parameter estimation and early warnings for intermediate-mass binaries like GW231123.
This paper demonstrates that in an Einstein universe, conformal coupling () is the unique parameter value ensuring thermodynamic stability for massless scalar fields across all temperatures and radii, while also establishing that the presence of electromagnetic and neutrino radiations necessitates at least one scalar field to maintain stability.
This paper provides a complete theoretical characterization of symmetry breaking, phase transitions, and crossovers in the large- limit of specific one-matrix random fuzzy non-commutative geometry ensembles, confirming its predictions through agreement with Monte-Carlo simulations.
This paper demonstrates that the linearized 3+1 Hamiltonian formulation of Teleparallel Equivalent of General Relativity (TEGR) is initially non-hyperbolic due to imaginary eigenvalues in its principal symbol, but becomes strongly hyperbolic after removing the problematic sectors via gauge fixing, thereby establishing a foundation for well-posedness and numerical relativity in TEGR.
This article shows that a non-singular cosmological bounce model driven by a phantom scalar field coupled to the Gauss-Bonnet term and, in particular, stabilized by bulk viscosity successfully satisfies observational constraints from Pantheon+ supernova data and Planck-2018 inflation limits while avoiding the instabilities present in non-viscous models.