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 clarifies that observational evidence for effective phantom dark energy, derived from background-level reconstructions within standard cosmological assumptions, does not necessarily imply the existence of fundamental phantom fields, microscopic instabilities, or a catastrophic cosmic future, but rather can arise from various physical mechanisms without violating fundamental energy conditions.
This paper proposes a quantum-mechanical model of Newtonian cosmology where zero-point motion resolves classical singularities and, in the presence of a small positive cosmological constant, describes a metastable universe that evolves through gestation, rapid tunneling expansion, and slower Hubble expansion, closely mirroring modern inflationary scenarios.
This paper presents a new method for directly separating the linearized Einstein equations in a Kerr black hole background, aiming to bypass the limitations of the conventional approach that relies on solving Teukolsky equations followed by metric reconstruction.
This paper presents a holographic model of black hole evaporation in asymptotically flat spacetimes using Brill-Lindquist wormholes and the HRT formula to demonstrate that entanglement entropy follows the Page curve while numerically verifying the predictions of the Python's Lunch conjecture regarding restricted complexity.
This study employs a chaotic magnetic field approximation to demonstrate that strong magnetic fields (-- G) systematically increase neutron star radii and tidal deformabilities by up to 18%, necessitating corrections to current gravitational wave constraints on the dense matter equation of state.
This paper explicitly constructs the effective density matrix and modular Hamiltonian for the vacuum state of a large spherically symmetric causal diamond in four-dimensional asymptotically flat gravity by utilizing the soft effective action to integrate out soft graviton modes, thereby revealing that the variance of the modular Hamiltonian scales with the diamond's area and the inverse square of the UV cutoff.
This paper presents a simple analytic framework combining local Schwarzschild geometry with cosmological dynamics to derive a relation between the apparent angular size of a black hole's shadow and the angular diameter distance, demonstrating that cosmic expansion significantly affects shadow measurements only for high-redshift sources.
This paper extends the Bondi formalism to asymptotically-flat spacetimes with non-vanishing twist by solving the Einstein equations for a generalized gauge, thereby deriving the complete solution space, flux-balance laws, and enhanced asymptotic symmetries (including Carroll boosts), while enabling finite radial expansions for algebraically special solutions like Kerr-Taub-NUT and supertranslated Schwarzschild.
This paper establishes a duality between gravitational junctions in 3D anti-de Sitter spacetime and stringy wave-packets in conformal field theories, demonstrating that these modes undergo perfect reflection without distortion and can be decoded via the entanglement entropy of intervals straddling the interface, even in the tensionless limit.
This paper extends the first law of black hole mechanics from infinitesimal changes between equilibrium states to finite changes driven by physical processes using dynamical horizon segments, thereby providing a natural identification of dynamical black hole entropy with the area of these segments.