3256 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 proposes that strongly clustered, light primordial black holes can collapse into heavier black holes to constitute all dark matter, a scenario that would produce a detectable flat stochastic gravitational wave background observable by the Einstein Telescope.
This paper evaluates the limitations of traditional posterior predictive checks (PPCs) for poorly constrained gravitational-wave parameters and demonstrates that while PPCs on maximum likelihood parameters are theoretically superior, current observational data lacks the sensitivity to diagnose model misspecification in spin tilts, ultimately revealing that the Gaussian Component Spins model in the GWTC-4.0 catalog fails to accurately predict large spin magnitudes and perfectly anti-aligned tilts.
This paper provides a self-contained overview of applying quantum spacetime and quantum Riemannian geometry to theoretical physics, highlighting recent successes such as vacuum energy calculations and a new theory of generally covariant quantum mechanics for black holes, while also presenting new findings like a phase transition in Euclidean quantum gravity and discussing future directions.
This paper provides a pedagogical 1+1-dimensional analysis of the relationships between cosmic time, conformal time, and the scale factor in a spatially flat Friedmann–Robertson–Walker universe, clarifying how these variables govern particle geodesics and spacetime curvature across radiation-dominated, matter-dominated, and de Sitter scenarios.
This study demonstrates through new GRMHD simulations and polarized radiative transfer analysis that the singularity-free Kerr-Hayward metric produces black hole images and observables that are functionally indistinguishable from the standard Kerr metric under current Event Horizon Telescope measurement capabilities.
This paper investigates a rotating acoustic black hole in a (2+1)-dimensional Lorentz-violating background, demonstrating that symmetry violation enhances the absorption cross section across all energy scales while accelerating the damping of quasinormal modes by reducing their real frequencies and increasing the magnitude of their imaginary parts.
This paper demonstrates that the previously observed universal negativity of the equilateral bispectrum from massive scalar exchange during inflation is not a generic feature, but rather a consequence of restricted operator structures, as including additional EFT operators, reduced sound speed, or multi-particle exchanges can flip the bispectrum's sign to positive.
This paper reviews the evolution of global hyperbolicity in mathematical relativity by examining classical concepts like Cauchy hypersurfaces and naked singularities alongside recent structural results, embeddability theorems, and revised boundary definitions, while also presenting specific criteria for verifying global hyperbolicity in splitting and standard stationary spacetimes.
This paper completes the analytical solution for the conservative dynamics of a binary black hole system with arbitrary masses, spins, and eccentricity at 1.5 post-Newtonian order by computing the final missing action variable using a novel phase-space extension method, thereby establishing a foundation for higher-order perturbative modeling in gravitational wave astronomy.
Using 3D hydrodynamical simulations, this paper demonstrates that the critical obliquity predicted by semi-analytic models for supermassive black-hole binaries corresponds to a disc-breaking phenomenon that disrupts the accretion disc and can compromise or prevent the alignment of black-hole spins with the orbital angular momentum.