2593 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 while asymptotic safety provides a fixed point for quantum gravity, standard approximation methods like derivative expansions and RG improvement fail to correctly predict scattering amplitudes in massless theories, necessitating full momentum-dependent computations to resolve infrared subtleties and ensure boundedness.
This paper derives the equation of motion for circularly polarized light in curved spacetime to demonstrate that the optical Magnus effect modifies gravitational lensing by preventing the formation of Einstein rings from point sources and altering image formation in axially symmetric systems.
This paper introduces \texttt{py5vec}, a modular Python package that implements and extends the 5-vector method for continuous gravitational wave searches by incorporating robust statistical improvements, enabling Bayesian parameter estimation, and validating its performance on LIGO O4a data.
This paper proposes a crowdsourcing approach to detect ultralight axions by analyzing the collective gravitational wave signals from axion clouds around the entire population of black holes in the Milky Way and the universe, demonstrating that current and future detectors like LIGO, Einstein Telescope, and Cosmic Explorer can robustly probe axion masses in the range of to eV.
This paper analyzes the phenomenological viability of primordial micro black holes as dark matter in modified gravity scenarios, concluding that while neutron star survival provides the strongest constraints, specific parameter regions remain consistent with observations and offer testable signatures through pulsar anomalies, neutrino emissions, and merger-induced bursts.
This study demonstrates that neglecting numerical-relativity calibration uncertainties in gravitational-wave waveform models can lead to false detections of deviations from general relativity in parametrized post-Einsteinian tests, but incorporating these uncertainties explicitly ensures robust and reliable theory testing even at high signal-to-noise ratios.
This paper proposes a quintessential inflation model within metric-affine gravity, where non-minimal couplings with the Holst invariant generate a quasi-pole behavior that successfully unifies early inflation and late-time dark energy while predicting a narrow, testable range for the scalar spectral index () consistent with observational constraints.
This paper derives general formulas for the quasi-normal mode frequencies of hairy black holes, modeled as vacuum black holes perturbed by an anisotropic fluid, by leveraging the correspondence between quasi-normal modes and geodesics.
This paper establishes the first observational constraints on causal nonlocal gravity extensions by combining Bayesian ringdown analysis of 17 binary black hole events from GWTC-3 with modified dispersion relation bounds, effectively ruling out specific infrared-extended spectral densities while identifying sub-millimetre gravity experiments as the most promising avenue for future direct tests.
This paper investigates the Einstein-Maxwell-Scalar theory with fractional coupling, demonstrating through static solutions and numerical simulations that strong coupling induces negative energy density and near-horizon geometric degeneration, thereby suggesting a classical mechanism for violating the weak cosmic censorship conjecture.