2558 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 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.
This paper proposes and observationally validates a viable cosmological model in Kantowski–Sachs spacetime where a massless nonlinear spinor field coupled to a Modified Chaplygin Gas unifies dark matter and dark energy, successfully reproducing late-time cosmic acceleration and fitting current data better than the standard CDM model while predicting an effectively isotropic universe today.
This paper explores how the future ALMA2040 upgrade will leverage enhanced sensitivity and multi-frequency capabilities to rigorously test General Relativity in strong-gravity regimes and elucidate the mechanisms behind relativistic jet formation.
This paper presents a systematic framework for identifying active screening mechanisms in luminal Horndeski gravity by deriving a master equation that recovers known Vainshtein and Chameleon effects while introducing a novel "Phaedrus" regime, supported by newly developed software tools for computing perturbations and solving nonlinear scalar equations.
This article investigates stationary, low-angular-momentum, axially symmetric accretion onto a black hole with a spatially varying adiabatic index and shows that the resulting multi-transonic flow supports stable stationary shock waves as well as an emergent acoustic geometry featuring both black-hole and white-hole horizons, whose surface gravities are determined by local variations in the speed of sound.
This paper demonstrates that gravity-like phenomena are not merely artifacts of linear perturbation but emerge from nonlinear higher-order perturbations in spherically accreting astrophysical systems with variable adiabatic indices, resulting in a dynamic effective acoustic spacetime where the acoustic horizon shifts in response to fluctuations in density, temperature, and mass accretion rate.
This paper demonstrates excellent agreement between fully nonlinear numerical simulations and effective-one-body analytic models for binary black hole scattering in Einstein-scalar-Gauss-Bonnet gravity, validating the capture of strong-field scalar-gravitational dynamics and paving the way for semi-analytical waveform templates in modified gravity theories.