3919 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 demonstrates that a specific class of semi-classical gravity models, including the Newton-Schrödinger and Bohmian analogues, fails to generate entanglement between massive systems, thereby distinguishing them from standard quantum gravity predictions in the context of proposed experimental tests.
This work demonstrates that in composite gravity models in the infrared regime, dynamical tensor fields with finite kinetic terms emerge via the functional renormalization group flow, reproducing the transverse-traceless sector of the diffeomorphism-invariant Einstein-Hilbert action, while longitudinal and trace contributions remain uninterpreted as gauge-fixing artifacts.
This study demonstrates that the interpretation of the gravitational-wave event GW231123 as a merger of massive, highly-spinning black holes is robust against waveform model systematics and Gaussian detector noise, confirming that its key properties, particularly high mass and spin magnitudes, are reliably inferred using the NRSur7dq4 model.
This paper proposes a reformulation of the Diósi-Penrose model that derives wave-function collapse from a quantum Kushner-Stratonovich equation, treating the universe as a detector that filters quantum states via space-time homodyning of output quadratures rather than relying on postulated background gravitational fluctuations.
This paper investigates a renormalization-group improved Schwarzschild black hole, analyzing its horizon structure, shadow, quasinormal modes, and thermodynamic properties to demonstrate that it remains the most Schwarzschild-like regular black hole while exhibiting a Davies-type phase transition and near-marginal violations of Strong Cosmic Censorship at its inner Cauchy horizon.
This study demonstrates through analytical and numerical methods that the fundamental mode of black hole quasinormal frequencies exhibits extreme sensitivity to small perturbations in the effective potential, with the specific nature of this spectral instability depending on the potential's shape and the spatial behavior of the perturbations.
This paper establishes the equivalence between Ruhl's analytic definition of Toller matrices and the Feynman prescription in causal spinfoams, demonstrating that these objects can be represented as integrals over boost eigenvalues that reproduce the Wick rotation between Euclidean and Lorentzian spinfoam models.
This paper presents a covariant quantization of the first-order Einstein-Hilbert theory using path integral and BV formalisms, demonstrating the closure of the gauge algebra, deriving a novel trivial local symmetry, and establishing the quantum equivalence between first- and second-order formulations at the level of the effective action.
This paper investigates the dynamics of massive test particles and high-frequency quasi-periodic oscillations (HF QPOs) around a static black hole in nonlocal gravity, demonstrating that the nonlocal parameter enhances the effective potential and radiative efficiency while reducing the ISCO radius, and subsequently constrains the nonlocal parameter to and the black hole mass to based on QPO resonance models and observational data.
This paper presents a fast and effective technique using the intrinsic chirp mass spectrum of binary black holes to demonstrate that one year of Einstein Telescope observations can constrain the Hubble constant to 1% and the matter density parameter to 4% using gravitational wave spectral sirens.