2575 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 nontrivial sound speed during inflation significantly alters the quantum-information diagnostics of cosmological perturbations by suppressing state purity, amplifying entropic and entanglement measures, and postponing the onset of classicality through modified decoherence dynamics.
This paper demonstrates that accelerating scaling attractors in a two-fluid cosmological system with dark matter particle creation can emerge without dark energy, but only when the energy exchange is driven by dark matter density and flows from dark matter to the second fluid.
This paper demonstrates that a quantum system comprising a harmonic oscillator polynomially coupled to a ghost with negative kinetic energy can be consistently quantized with a well-defined vacuum and manifestly unitary evolution, provided the system possesses an integral of motion with a positive discrete spectrum that ensures stability despite the Hamiltonian's unbounded spectrum.
This study demonstrates that a data-driven parameter estimation framework incorporating broad priors on waveform phase and amplitude uncertainties effectively mitigates systematic errors in LIGO-Virgo O1-O3 binary black hole merger analyses, thereby resolving inconsistencies across different waveform models and data processing methods for key events like GW191109\_010717 and GW200129\_065458.
This paper defines invariant, Carrollian-geometric extended boundaries at timelike and spatial infinity (Ti and Spi) for asymptotically flat spacetimes, demonstrating their utility in characterizing asymptotic symmetries, realizing massive field scattering data, and naturally recovering the BMS and Poincaré groups along with Strominger's matching conditions.
This paper investigates Horizon Brightened Acceleration Radiation (HBAR) using derivative coupling between atoms and field momentum to resolve infrared divergences, revealing that point-like detectors exhibit frequency-independent transition probabilities due to local gravitational effects and that finite-size detectors may induce non-equilibrium thermodynamic states.
This paper demonstrates how the Gravity Spy project leverages Zooniverse volunteers to identify new LIGO glitch classes, revealing their connection to detector states and highlighting the challenges they pose for machine-learning classification.
The paper summarizes the GR-Amaldi 2025 Early Career Workshop, a three-day event designed to unite early-career researchers in gravitational physics through scientific overviews, skill development, and networking to foster a cohesive and collaborative community.
The paper argues that while stationary black holes adhere to standard Bekenstein-Hawking thermodynamics, the evolving universe fundamentally requires a "teleodynamic" framework driven by horizon memory accumulation, thereby establishing a distinct thermodynamic regime for cosmology that challenges the extrapolation of black hole thermodynamics to the universe.
This paper analyzes curvature invariants across a broad ensemble of neutron star equations of state, revealing that negative Ricci scalars are surprisingly common in massive, compact stars, while also refining the quasi-universal mass relation and determining the conditions under which the trace anomaly vanishes or becomes negative.