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 proposes a holographic model where cold dark matter is a strongly-interacting fluid described by a linear dilaton 5D braneworld, featuring a thermodynamically favored bulk black hole that naturally produces the observed dark matter abundance via a freeze-in mechanism constrained by a 5D Planck scale of at least TeV.
This paper numerically constructs self-similar wormhole solutions supported by negative-energy null dust and demonstrates their dynamical formation from an initial black hole by patching Schwarzschild, negative-energy Vaidya, and wormhole geometries across null shells using the Barrabes–Israel formalism.
This paper derives closed-form spatial correlation functions for gravitational-wave backgrounds with arbitrary polarization and dispersion, demonstrating that while source interference alters correlation shapes, it preserves the fundamental multipole signatures of each polarization mode, thereby establishing a theoretical limit on distinguishing modified gravity from General Relativity using spatial correlations alone due to the statistical degeneracy inherent in a single realization of the Universe.
This paper argues that while local symmetries in physics are often treated as harmless redundancies within "internally sophisticated" theories, their necessity to be made explicit depends on the specific representational framework and operational tasks, a pattern best captured by the proposed criterion of "background-relative sophistication."
This paper presents a fully discrete, non-perturbative BF formulation of Jackiw-Teitelboim gravity that derives boundary symmetries, quantization, and Bekenstein-Hawking entropy directly from lattice holonomies and dilatons, thereby reproducing continuum results without relying on a fundamental Schwarzian action.
This paper pragmatically constrains the initial states of relic gravitons at the moment their wavelengths cross the comoving Hubble radius, concluding that while non-vacuum states are marginally permitted for low-frequency modes, the intermediate and high-frequency spectrum (kHz to THz) is dominated by vacuum-produced gravitons with negligible initial state contributions.
This paper systematically investigates the radiative properties and optical appearance of rotating Simpson-Visser black holes with thin accretion disks, demonstrating that while the regularization parameter suppresses radiative flux and intensity while widening the photon ring, it leaves radiative efficiency unchanged compared to Kerr black holes, thereby offering distinct observational signatures for future high-resolution tests.
This paper investigates how quasi-universal relations used to connect neutron star properties may introduce biases in equation-of-state constraints for third-generation gravitational-wave detectors, finding that while most relations remain useful, specific cases involving rapid rotation or low-mass binaries require careful treatment to avoid systematic errors.
The paper argues that the gravitational S-matrix in dimensions greater than four fails to be a unitary operator in Fock space due to the orthogonality of high-energy black hole states, yet suggests that physical unitarity may be recovered through an algebraic formulation based on fermionic oscillators, pending a rigorous proof of Poincaré invariance for the S-matrix amplitudes.
This paper constructs exact Gödel-like solutions within a five-dimensional Galilean gravity framework by coupling the gravitational field to a variational fluid, resulting in rotating non-relativistic universes that remain free of closed timelike curves because the associated Killing vector stays spacelike everywhere.