4035 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.
By consistently applying the gravitational path integral to compute both amplitudes and normalization norms, this paper demonstrates that the Hartle-Hawking no-boundary proposal predicts probabilities of nearly or exactly one for closed universes, implying that all relevant cosmological states are effectively parallel to the Hartle-Hawking state.
This paper demonstrates that a recently proposed static ellipsoidal metric, along with a cited alternative, fails to represent a vacuum solution because it yields non-zero Einstein tensor components, Ricci scalar, and fluid pressures when analyzed using Maple's differential geometry package.
This paper reports a fourfold improvement in testing the Equivalence Principle towards the Sun using a rotating torsion balance with beryllium and aluminum test bodies, achieving a 95%-confidence limit of .
This paper utilizes the observed 11.24-year jet precession period of M87* within the Kerr-Bertotti-Robinson spacetime to derive a stringent, shadow-independent upper bound on the black hole's magnetic field strength (), demonstrating that jet precession serves as a robust probe for magnetized black holes in strong gravity.
This paper derives exact analytical expressions for the quasi-normal mode frequencies of non-minimally coupled scalar and spinor fields in a (1+1)-dimensional dilatonic black hole, demonstrating that the purely imaginary scalar modes and the complex Dirac modes both decay monotonically with the overtone number, thereby confirming the spacetime's stability under these perturbations.
This paper presents a novel exact black hole solution embedded in a Dehnen dark matter halo, demonstrating that the halo stabilizes the black hole's thermodynamics, induces phase transitions, and significantly alters its photon sphere, shadow radius, and eikonal quasinormal modes.
This paper employs the island paradigm to demonstrate that Kerr-AdS black holes exhibit a unitary Page curve that transitions from linear growth to a constant value, while revealing that first-order phase transitions induce sharp discontinuities in the curve across different thermodynamic ensembles.
This paper establishes a method to compute cosmological correlators in de Sitter space by relating their energy discontinuities to unitarity cuts of flat-space scattering amplitudes via auxiliary propagators, thereby enabling the reconstruction of these observables through dispersion relations and sum rules.
The RDK II collaboration reports the observation of thermal photons from accelerated electrons via radiative beta decay, confirming a one-dimensional Planck spectrum consistent with the dynamical Casimir effect and the moving mirror model.
This paper proposes that dark energy emerges naturally from a topological mechanism involving massless chiral spinors and harmonic 1-forms in spacetimes with internal boundaries, which induce contortion terms in the Einstein-Cartan action that mimic General Relativity with a cosmological constant.