3285 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 investigates cosmic void evolution within Horndeski theory using the effective field theory of dark energy, revealing that modifications to the critical density contrast are suppressed by compensating effects while the resulting void abundance exhibits scale-dependent changes driven by both the linear matter power spectrum and the critical density contrast.
This paper establishes a globally consistent definition of the M-theory partition function within the democratic formulation by utilizing a path-integral approach that reveals a Heisenberg-type group structure arising from the quadratic coupling between electric and magnetic form fields.
This paper proposes and validates a "time aligned orbit" around the Moon where a single orbital clock can simultaneously realize both Lunar Coordinate Time and lunar geoid proper time, offering a scalable solution for establishing a unified lunar time reference system.
This paper presents a practical and physically transparent formulation of the Schwarzschild Green's function by decomposing it into and components based on large-frequency behavior, thereby clearly separating the direct part, quasinormal modes, and late-time tail through their distinct analytic structures in the complex-frequency plane.
This paper investigates how Dehnen-type dark matter halos influence particle motion and strong-field observables in regular black hole spacetimes, revealing that the halo's scale parameter and density slope significantly alter characteristic radii, orbital stability, and accretion efficiency.
This study revisits the prospects of detecting solar -modes with space-based gravitational-wave detectors like LISA and TianQin, finding that updated solar models and sensitivity curves predict negligible signal differences between metallicity variations, suggesting that solar metallicity uncertainties have a minimal impact on detectability.
This paper demonstrates that a covariant quantum field theory of purely virtual tachyons is unviable due to fatal obstructions including non-invariant commutation relations under Lorentz boosts, disjoint propagator supports, and violations of Lorentz invariance and the equivalence principle when interacting with Standard Model fields.
This paper investigates whether the observed preference for dynamical dark energy crossing the null energy condition boundary in recent DESI DR2 data persists when allowing for negative dark energy densities, finding that while such sign-switching models reduce the statistical significance of deviations from a cosmological constant, they are disfavored and primarily driven by late-time data pushing the negative-density phase beyond observable redshifts.
This paper investigates the quasinormal modes and grey-body factors of scalar, electromagnetic, and Dirac fields around regular black holes supported by an Einasto density profile, revealing that while the quasinormal spectrum is significantly influenced by the Einasto index and halo parameter, the grey-body factors remain largely similar to the Schwarzschild case with only mild low-frequency suppression.
This paper introduces a novel analytical dynamical framework that derives precise energy density evolutions for CDM and CDM models, demonstrating their agreement with standard CDM while revealing the CDM model's unique capacity to capture complex modified gravity epochs and transitions through a comprehensive global dynamical analysis.