3256 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 develops a nonperturbative tensor-network framework using Matrix Product States to compute cosmological correlators in de Sitter space, providing controlled evidence that in-in correlators can be derived from a gluing-based in-out formalism while revealing that the latter induces significantly larger entanglement growth, making the former numerically more favorable.
This paper employs the Schwinger-Keldysh influence functional formalism to demonstrate that the decoherence rate of an accelerated Unruh-DeWitt detector coupled to various quantum fields scales as , revealing that higher scaling dimensions of environmental field operators significantly enhance decoherence and offer a more sensitive probe for the Unruh effect.
This paper constructs regular, horizon-free, and asymptotically flat traversable wormhole solutions inspired by noncommutative geometry by utilizing a nontrivial redshift function and reformulating the required exotic matter through quasi-de Sitter and Chaplygin-like equations of state to confine NEC violation to a thin neighborhood of the throat.
This paper develops a general framework for analyzing circular particle orbits under arbitrary external forces in static spherically symmetric spacetimes, revealing that such forces can induce new stable orbit branches and near-horizon trajectories in extremal black holes, thereby enabling high-energy collisions with behavior analogous to the BSW effect in rotating black holes.
This paper proposes a Simulation-based Inference framework using Neural Posterior Estimation that rapidly generates systematics-aware posterior distributions for Intermediate-Mass Binary Black Hole signals by marginalizing over waveform model discrepancies, achieving millisecond inference times with accuracy comparable to traditional methods.
This paper employs general relativistic smoothed particle hydrodynamics simulations to demonstrate that the distinct spacetime geometries of black holes and wormholes produce measurable differences in stellar tidal disruption events, specifically regarding the extent of tidal stripping, critical impact parameters, and fallback rates, thereby offering a method to observationally distinguish between the two compact objects.
This paper demonstrates that all three-dimensional conformal field theories (CFTs), including those dual to quantum gravity in AdS, possess an symmetry generated by the ANEC operator and its descendants, thereby extending previously known tree-level soft symmetry results to the strongly-coupled quantum regime.
This paper demonstrates through new numerical relativity simulations of high-mass-ratio, precessing binary black hole systems that current gravitational waveform models suffer from severe inaccuracies, leading to significant mismatches and parameter estimation errors exceeding 100%, thereby highlighting an urgent need for model improvements.
This paper investigates how new physics prior to recombination affects late-time dynamical dark energy models, finding that while such early-time solutions can alleviate the Hubble tension, they introduce severe conflicts with matter density constraints and render the evidence for phantom-crossing dark energy inconclusive.
This paper presents a phenomenological framework for reconstructing static, spherically symmetric Unified Dark Matter (UDM) halo configurations that replicate standard Cold Dark Matter rotation curves while satisfying relativistic stability conditions and unifying dark matter and dark energy into a single scalar-field model.