3151 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 tabletop quantum-optical simulator using entangled nonlinear biphoton sources to emulate Unruh-DeWitt detector dynamics, demonstrating that phase-controlled signal and idler modes can effectively reproduce relativistic phenomena such as vacuum-induced excitation, coherence harvesting, and field-induced entanglement.
This paper computes the first-order correction in quartic coupling to the entanglement entropy of a non-minimally coupled massive scalar across a Schwarzschild horizon, demonstrating that the resulting divergences are renormalized by bulk mass and Newton's constant counterterms while the finite correction vanishes for conformal coupling.
This paper presents a solution within Einstein-Dirac-Maxwell theory where an asymmetric wormhole supported by a complex spinor field and electromagnetic fields connects two universes with distinct physical parameters, effectively modeling a classical particle with spin by exhibiting Standard Model mass and charge at one end while displaying Planck-scale values at the other.
This paper presents an augmented, first-order, nonlocal formulation of f(R) gravity in spherical symmetry using generalized Bondi-Sachs coordinates, which treats the scalar curvature as an independent variable to eliminate higher derivatives and enables the rigorous analysis of the characteristic initial value problem for a massive scalar field.
This paper presents an elementary derivation of Binet's equation from infinitesimal displacements, introduces a novel method for obtaining its relativistic version in Schwarzschild-(anti-)de Sitter metrics without using potentials or Killing vectors, and addresses controversies regarding the cosmological constant's role in photon trajectories.
This paper proposes and validates a new thermodynamic inequality, , for rotating Anti-de Sitter black holes across various topologies and dimensions, demonstrating its role in preserving cosmic censorship and its compatibility with the reverse isoperimetric inequality.
This paper demonstrates that coherently combining a population of sub-threshold gravitational-wave signals from binary neutron star mergers can statistically constrain the maximum mass of hot, rapidly rotating neutron stars and the nuclear equation of state, potentially revealing evidence for first-order phase transitions in dense matter.
This paper establishes a comprehensive framework for scalar, vector, and tensor fields on three-dimensional de Sitter spacetime by defining their spherical harmonics, explicitly deriving the non-local antipodal relationships between past and future asymptotic data in the presence of arbitrary sources, and proving decomposition theorems that are instrumental for describing interacting four-dimensional asymptotically flat fields.
This paper investigates whether apparent deviations from the CDM model in dark energy dynamics reflect genuine phantom-like evolution or parametrization artifacts, finding that while flexible models like power-law forms mildly improve fits and consistently suggest phantom behavior at intermediate redshifts (), the statistical significance remains modest and the specific evolutionary details are not robustly constrained.
This paper investigates the cosmological gravitational production of stable spin-3/2 particles, termed "raritrons," demonstrating that their ability to constitute dark matter depends critically on the mass hierarchy relative to the inflationary Hubble scale, which governs the sound speed of the longitudinal mode and can lead to significant enhancements in particle production, particularly for lighter masses or time-dependent mass scenarios.