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 introduces GWSkyNet-MassGap, a neural network model trained to rapidly predict the probabilities of gravitational-wave candidates containing components in the lower mass gap or being neutron stars, achieving high accuracy for high-mass mergers while highlighting the need for mass ratio information to resolve degeneracies in lower-mass systems.
This paper investigates a modified gravity model involving a scalar field and its kinetic term, demonstrating that while standard Gödel metrics are incompatible with the theory's scalar sector, Gödel-type solutions allow for both causal and noncausal configurations depending on the matter source, with scalar fields uniquely constraining the geometry to prevent the formation of closed timelike curves.
This paper employs 3+1 numerical simulations to demonstrate that kinetic screening in shift-symmetric scalar-tensor theories non-monotonically affects scalar emission from binary neutron stars—either suppressing or enhancing the quadrupolar amplitude depending on the ratio of the screening radius to the radiation wavelength—and reveals that while unequal-mass binaries revive a scalar dipole, cosmologically motivated parameters may only moderately suppress scalar radiation in systems like the double pulsar.
This paper proposes a non-supersymmetric baryogenesis mechanism where nonlinear dynamics of a complex scalar field with -breaking potentials dynamically generate a baryon asymmetry from symmetric initial conditions, with one specific potential model offering a mass-independent, predictive framework capable of explaining the observed baryon-to-photon ratio.
This paper establishes an effective field theory framework for the dynamical tidal response of spinning Kerr black holes to generic perturbations, deriving linear-frequency tidal Love numbers and response coefficients by matching worldline couplings to full perturbation solutions while accounting for spin-induced multipolar mode mixing.
This paper proposes a fabrication-tolerant hybrid metasurface-Bragg mirror design for the ET-Pathfinder gravitational-wave detector that combines a one-layer metasurface with a reduced Bragg stack to achieve high reflectance and significantly lower thermal noise than conventional coatings, even when accounting for manufacturing imperfections.
This paper investigates how imposing the existence of specific General Relativity solutions, such as Schwarzschild or de Sitter black holes with stealth scalar hair, restricts the parameter space of general quadratic and cubic scalar-tensor theories, revealing that while requiring all such solutions eliminates odd-parity deviations from GR, less restrictive scenarios allow for specific deviations, stability constraints, and modified gravitational wave speeds.
This paper establishes a synthetic framework for null hypersurfaces in non-smooth spacetimes by defining a synthetic null energy condition via optimal transport, which generalizes classical results to singular settings and enables the proof of Hawking's area theorem and Penrose's singularity theorem in continuous and topological causal spaces.
This paper proposes and demonstrates through simulations that a photon-counting readout scheme, which quantizes signals and noise into discrete photon distributions, can effectively detect rare, low signal-to-noise ratio gravitational waves from neutron star merger remnants and significantly improve constraints on neutron star radii compared to traditional homodyne techniques.
This study investigates the observational signatures of non-singular black holes in Eddington-inspired Born-Infeld gravity with anisotropic fluids, concluding that while their photon ring structures exhibit theoretical deviations from Schwarzschild counterparts, current observational and modeling uncertainties prevent their distinction without incorporating dynamic features like hot-spots or gravitational wave signals.