2371 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 argues that the Hamiltonian (or Hamiltonian constraint) alone cannot uniquely determine the tensor product structure of a quantum system's Hilbert space, thereby emphasizing that explicitly specifying the algebra of observables and their dynamical interplay is essential for defining a consistent general covariant quantum theory.
This paper presents 52 new numerical-relativity simulations of black-hole-neutron-star mergers focusing on tidal disruption, which are used to develop and validate the improved, multipolar TEOBResumS-Dalí model capable of accurately describing precessing, eccentric systems with enhanced accuracy at merger.
This paper computes the exact analytical inflationary trispectrum of primordial gauge fields arising from scalar and tensor exchanges in spectator models, revealing distinct momentum and angular dependencies that establish hierarchical relations with lower-order correlations and offer novel observational signatures for early-universe tensor interactions.
This paper presents updated observational constraints on the spatially flat CDM dynamical dark energy model using Planck 2018 and non-CMB data, finding that while the standard CDM model remains an excellent fit, current data mildly favor evolving quintessence-like dark energy and reveal tensions in the Hubble constant and CMB lensing amplitude that are partially alleviated by allowing the lensing consistency parameter to vary.
Through numerical relativity simulations of equal-mass black hole scattering, this study reveals that systems with anti-aligned spins, high momenta, and incident angles near the merger threshold experience the most significant mass gain and spin-up, with maximum increases of 15% in mass and 0.3 in spin, while noting that high initial prograde spins can paradoxically lead to spin-down despite angular momentum growth.
This paper demonstrates the robust emergence of Schrödinger symmetry in spherically-symmetric static mini-superspace models containing Maxwell and massless scalar fields through canonical transformations, identifying specific spacetime solutions and proposing a physical interpretation where symmetry generators either map solutions within a theory or generate new theories with transformed configurations.
This paper presents remarkably simple, dimension-independent covariant expressions for graviton and ghost propagators in Anti-de Sitter spacetime, achieved by selecting a special gauge-fixing condition that ensures improved infrared behavior and is unattainable in flat spacetime.
This paper presents a general framework for simulating polarized emission from inspiraling hotspots around Kerr black holes, revealing that their inward spiral motion produces distinctive, unwinding polarimetric Q-U loop signatures that differ significantly from the closed loops of stable orbits, thereby offering a new method to probe accretion physics and spacetime geometry.
This paper investigates the thermodynamics of a Schwarzschild black hole within non-commutative gauge theory, demonstrating that non-commutative corrections remove temperature divergence, introduce logarithmic entropy corrections, and result in extremely sparse Hawking radiation that diverges as the black hole approaches the final stage of evaporation.
This paper constructs the phase space for an arbitrary cut of a null hypersurface in Minkowski spacetime and demonstrates its symplectomorphism to the infrared phase space of asymptotically flat gravity, explicitly mapping cut fluctuations to leading soft graviton modes and the supertranslation Goldstone mode to the product of the cut's size and its null time offset.