3784 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 the ergodicity bias—the discrepancy between ensemble and volume averages in finite cosmological systems with long-range correlations—becomes significant for density perturbations on scales larger than approximately 560 Mpc, rendering the infinite-volume limit irrelevant for current large-scale structure observations.
This paper derives the Saha ionization equilibrium in Schwarzschild spacetime by incorporating gravitational redshift into the Maxwell-Boltzmann distribution, demonstrating that while an asymptotic observer sees modified ionization ratios due to redshift, the local equilibrium remains identical to the standard flat-spacetime equation when expressed in locally measured quantities.
This paper investigates the resonant interaction between stochastic gravitational waves and chiral Alfvén waves in the early Universe's magnetized plasma, demonstrating that their coupling leads to a parametric resonance causing finite-time blow-up and predicting observable signatures for current and future gravitational-wave detectors.
This paper introduces a family of coarse-grained models for canonical loop quantum gravity, constructed via a systematic spin network coarse-graining procedure and effective Hamiltonians, to establish a renormalization framework for studying continuum limits and deriving phenomenological models.
This paper presents the first continuous numerical evolution of Nambu-Goto cosmic string loops under gravitational backreaction, revealing that while cusps persist, the resulting gravitational wave bursts are significantly weakened and high-frequency suppressed, thereby reducing their detectability compared to unperturbed predictions.
This paper extends the separate-universe approach to multifield inflation using a Hamiltonian phase-space formalism, demonstrating that the approximation accurately describes cosmological perturbations on super-Hubble scales and validating the uniform-expansion gauge for stochastic inflation applications relevant to primordial black hole production.
This paper proposes a renormalization group-based extension of the CDM model, where the cosmological constant and Newton's constant vary with energy scale due to massive quantum fields, successfully alleviating the tension while remaining consistent with CMB, BAO, and supernova data through a best-fit parameter .
This study demonstrates that carefully designed lightweight temporal convolutional networks can effectively detect gravitational waves in real LIGO noise, recovering key events from the GWTC-3 catalog with high sensitivity and minimal false alarms, suggesting that pipeline optimization often outweighs architectural complexity.
This paper evaluates the feasibility of subtracting astrophysical foreground signals from compact binary populations, inferred from LIGO-Virgo-KAGRA's fourth observation run, to enable DECIGO's detection of the primordial stochastic gravitational wave background, concluding that the Cutler & Harms (2005) projection scheme is essential for achieving the necessary signal reduction.
This paper investigates how ultraviolet modifications to regular black hole geometries influence cosmic expansion, finding that while different models yield distinct Friedmann equations, the best fit to observational data for explaining accelerated expansion corresponds to horizonless compact objects rather than traditional black holes.