2489 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 the apparent divergence of gyroscopic precession frequency near the Kerr black hole horizon is a coordinate artifact specific to Boyer-Lindquist coordinates, as the frequency remains finite in horizon-penetrating Kerr-Schild coordinates, proving that regularity is determined by the timelike nature of the trajectory rather than the horizon itself.
This paper introduces Cosmo-PINN, a Physics-Informed Neural Network that reconstructs the dark energy equation of state directly from late-time cosmological observations by embedding physical laws as hard constraints in the loss function, thereby ensuring physical consistency and revealing a phantom divide crossing that a purely data-driven approach fails to guarantee.
This paper demonstrates that supermassive black hole seeds (–) can form via the direct relativistic collapse of primordial cold dark matter curvature peaks during the matter-dominated era, identifying broad compensated peaks as viable progenitors that produce black holes at redshifts while characterizing the resulting singularity geometry based on initial shear conditions.
This paper analyzes the primary constraint structure of Newer General Relativity by performing a fully nonlinear decomposition of its Lagrangian, recovering known tensor and vector constraints while identifying a previously unreported degeneracy in the scalar sector that yields one or two additional constraints depending on the theory's parameters.
This paper establishes a complete dictionary between the Newman--Penrose and 1+1+2 semitetrad covariant formalisms by expressing all spin coefficients and curvature scalars in terms of 1+1+2 variables, thereby providing a geometrical interpretation of Newman--Penrose quantities and deriving necessary conditions for future outer trapping horizons in locally rotationally symmetric spacetimes.
GRTresna is an open-source, multigrid solver designed to generate initial data for numerical relativity simulations involving fundamental fields around black holes and inhomogeneous cosmological spacetimes, based on the formalism presented in arXiv:2207.03125.
This paper elucidates the mechanism behind the nonlocal information encoding of entang islands in a manifestly local theory by demonstrating that the effective mass of the graviton in island models, specifically within the Karch-Randall braneworld, enables the interior information of black holes to be encoded in early Hawking radiation.
Using recent cosmological data, this study constrains a Dirac--Born--Infeld dark energy model with a chameleon mechanism, finding that the model is mildly disfavored compared to CDM due to negligible improvements in fit quality and constraints indicating a lack of significant self-interaction.
This paper proposes a refined "local inflation bubble" mechanism to theoretically expand Planck-scale quantum wormholes into macroscopic structures within an inflationary de Sitter background, while calculating the specific stress-energy requirements and intrinsic lower bounds for the exotic matter needed to sustain such a bubble.
This paper demonstrates that in both Loop Quantum Cosmology and its modified variant, a combined potential featuring an ekpyrotic component can effectively suppress shear during the bounce to resolve anisotropy issues, while subsequently allowing the inflationary component to dominate and produce a sufficiently long inflationary phase.