3875 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 interactions between ghost fields and multi-particle states prevent the existence of free asymptotic ghost states by rendering their negative-norm one-particle states indistinguishable from positive-norm superpositions, thereby confining observable ghost propagation to timescales shorter than their inverse width.
This study utilizes energy-dependent Monte Carlo neutrino transport to evaluate the relative importance of various neutrino-matter interaction channels in binary neutron star merger remnants, revealing that inelastic electron scattering significantly impacts heavy-lepton neutrino thermalization and that pair annihilation rates are substantially higher in cold, low-density regions than previously estimated.
This paper proposes that a high-quality axion protected by a discrete gauge symmetry can naturally resolve the isocurvature problem in high-scale inflation by inducing a large effective axion mass during inflation, thereby simultaneously addressing the axion quality problem and predicting testable parameter spaces for future experiments.
This paper establishes weighted decay criteria for the profile of plane gravitational waves to distinguish between strongly, weakly, and non-asymptotically free motions, demonstrating that ordinary asymptotic freedom requires more than simple profile decay and that weak asymptotic freedom involves a drift correction that preserves displacement memory as an intrinsic curvature effect.
This paper argues that the internal norms of rigour in mid-twentieth-century theoretical physics prioritized enabling concrete calculations over abstract truth, a thesis supported by a historical case study showing that the crucial advancement in the development of the Wheeler-DeWitt equation (1962–1967) was not the equation's initial statement but its subsequent "rigorisation" through the definition of an inner product.
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.