2489 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 proposes a Kaniadakis holographic dark energy model within modified Kaniadakis cosmology using the Hubble radius as an IR cutoff, demonstrating that it can explain current cosmic acceleration without interaction, mimics a cosmological constant in a dark energy-dominated era, and exhibits phantom behavior and distinct statefinder evolution when interaction with dark matter is considered.
This paper proposes a novel fiber-based Sagnac interferometer to perform a precision terrestrial measurement of the Shapiro time delay, aiming to determine the PPN parameter gamma with a sensitivity of 10⁻⁹ and thereby provide an independent laboratory-scale test of General Relativity.
This paper argues against the conjecture that bulk local field algebras exist within causal diamonds at finite UV cutoffs, asserting instead that such a description only emerges in a double-scaled limit where the boundary cutoff and both approach infinity, thereby precluding any bulk field theory resolution of distances smaller than the AdS radius.
This paper establishes that gravitational helicity, derived as a conserved Noether charge from a duality symmetry in connection variables, is directly linked to the Nieh-Yan topological term when expressed in real variables.
Using hierarchical Bayesian inference on the GWTC-4.0 catalog, this study constrains the gravitational wave memory enhancement factor to be consistent with General Relativity and forecasts that approximately 2,500 detections are required to significantly distinguish the effect from zero.
This paper develops a comprehensive transfer analysis for rotating acoustic black holes with Lorentz symmetry violation in (2+1) dimensions, deriving key observables such as acoustic shadows, redshift asymmetries, and flux imbalances to demonstrate how the Lorentz-breaking parameter and rotation jointly influence the capture interval and intensity maps of thin rings and extended disks.
This paper demonstrates that Einstein-Cartan torsion provides a geometric mechanism to dynamically resolve the cosmic coincidence problem in non-interacting holographic dark energy by enabling a viable density ratio and cosmic acceleration without requiring phenomenological dark sector interactions or fine-tuning.
Using the BPHZL renormalization scheme, the paper proves that the renormalized gravitational effective action for a massless chiral fermion up to fourth order in graviton fields contains no parity-odd contributions, is equivalent to half the action of a non-chiral Dirac fermion modulo parity-even counterterms, and yields a purely parity-even Weyl anomaly equal to half that of a Dirac fermion.
This paper presents an exact analytical calculation of fermionic bubble loop contributions to cosmological collider signals using parallel spectral and Mellin-Barnes methods, revealing that Yukawa interactions with the inflaton yield a vanishing bispectrum due to a field redefinition of tree-level counterparts.
This paper presents exact analytical solutions for the gravitational collapse of a massive scalar field coupled with perfect fluid and dissipative matter in a conformally flat spacetime, demonstrating that such configurations evolve asymptotically without forming shell-focusing singularities within finite proper time, even when exhibiting effective exotic matter behavior.