3805 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 a generalized framework for quantum reference frames based on "genuinely quantum" permutations (magic unitaries), demonstrating that they enable non-commuting, local superpositions of transformations and extend symmetries in quantum field theories and gravity beyond the capabilities of traditional, classically-controlled reference frames.
Grounded in the Iyer-Wald formalism, this paper proposes a quasi-local Hamiltonian for generalized Kerr-Schild black holes that naturally recovers the Misner-Sharp mass for spherically symmetric spacetimes, extends it to rotating geometries, and establishes a geometric formulation for Kerr-AdS thermodynamics through a background-subtraction renormalization procedure.
This paper utilizes histories theory to demonstrate that process-matrix indefinite causal order is an operationally restricted manifestation of the more general phenomenon of superposed dynamics, while distinguishing between the kinematical ordering of events and the dynamical ordering of interventions to clarify the relationship between quantum causality and spacetime structure.
This paper demonstrates that neglecting inclination diffusion in relativistic loss-cone models is unjustified, as angular momentum magnitude and inclination diffuse on comparable timescales, leading to significant errors in the predicted prograde-retrograde flux distribution despite the integrated total flux appearing robust.
This paper presents a novel, achromatic method to measure black hole spin and inclination by computing a parity-odd gravitational imprint on the photon ring's linear polarization, which arises from frame-dragging-induced parallel transport and is robustly detectable in millimeter/sub-millimeter observations of sources like M87* and Sgr A*.
This paper proposes Gravitational Caloric Theory, an extension of general relativity featuring a vector field coupled to the fluid sector, which offers a natural resolution to the early dark energy coincidence problem and introduces novel cosmological scenarios like a self-tuning mechanism for the cosmological constant and an early static hot Universe as an alternative to inflation, while also being analyzed for its viability in strong-field regimes.
Numerical relativity simulations of rotating very massive and supermassive stellar core collapses reveal that lower-mass, pair-unstable cores undergo runaway collapse to form rapidly rotating black holes with massive disks that drive energetic ejecta capable of producing significant iron-group elements, whereas higher-mass cores experience homologous collapse with less efficient disk formation.
This paper demonstrates the existence of static, spherically symmetric traversable wormholes in trace-coupled gravity with an action, constructed via deformations that yield an exactly Schwarzschild exterior without thin shells while localizing exotic matter and Ricci curvature to a finite core through algebraic reconstruction of anisotropic sources.
This paper calculates the classical scattering of two gravitating compact objects mediated by a massive scalar field up to the second post-Minkowskian order, revealing distinctive next-to-leading-order phenomena including a resonance when the scalar range matches the impact parameter and a mass-screening effect in the large-mass regime.
This paper constructs the bulk kinematical Poisson structure of general relativity on a caustic-free null segment by identifying Carroll boosts as pure gauge, fixing the Ehresmann connection, and performing a three-stage Dirac reduction to derive the explicit non-local brackets for the resulting spin-0, spin-1, and spin-2 gravitational data.