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 the limitations of current pulsar timing array background estimation methods, demonstrating that sky and phase scrambling techniques suffer from rapid saturation which restricts the number of quasi-independent realizations and complicates the reliable assessment of high-significance gravitational wave detections.
By analyzing quantum corrections to the Friedmann equations within the framework of loop quantum gravity and string theory, the paper argues that the existence of a cosmological arrow of time implies the universe originated from a state of negative entropy, akin to a Dirac sea, rather than a traditional Big Bang.
This paper presents a new class of smooth, nonsingular, and geodesically complete inflationary models that resolve the initial singularity by utilizing controlled, localized violations of the null energy condition, thereby demonstrating that eternal inflation can arise from a past-eternal universe without requiring a Big Bang beginning.
This paper argues that detecting stimulated absorption of single gravitons in massive quantum resonators, correlated with LIGO gravitational wave observations, would provide the first experimental window into quantum gravity by probing the quantized interaction between gravity and matter, drawing parallels to the historical development of early quantum theory.
Using high-accuracy numerical relativity simulations, this paper confirms the presence of late-time gravitational-wave tails in merging black holes, demonstrating that these signals are significantly amplified by eccentricity and align strikingly with perturbative predictions, thereby validating black hole perturbation theory even in nonlinear regimes and suggesting the tails may be detectable by gravitational-wave observatories.
This paper re-examines velocity addition in Special Relativity by deriving its non-commutative and non-associative properties and the Thomas angle using standard matrix methods, while also introducing an alternative geometric framework based on the boost-link theorem to define invariant relative velocity and comparing it with Galilean spacetime.
This paper demonstrates that using comprehensive noise models in pulsar timing analyses, even when they include noise sources not actually present in the data, prevents systematic errors from biasing the estimation of gravitational-wave background parameters without introducing unnecessary prior-induced bias.
This paper demonstrates that for non-compact Lorentzian manifolds satisfying the "no observer horizons" condition, the group of time orientation-preserving isometries acts properly, leading to the existence of an invariant Cauchy temporal function and a structural decomposition of the isometry group into a compact subgroup and a time-translation component restricted to the trivial group, , or .
This study demonstrates that active galactic nucleus disks facilitate the capture and inspiral of extreme-mass-ratio binaries by reducing their inclination and semi-major axis while driving orbital circularization, with specific scenarios enabling rapid transitions from counter-rotation to co-rotation that significantly impact the modeling of future LISA sources.
This paper introduces proper time as a test-field degree of freedom in quantum cosmology to demonstrate that the no-boundary wavefunction recovers classical de Sitter bouncing behavior while predicting a smooth, unitary quantum bounce for radiation-dominated universes that classically encounter a singularity, driven by Heisenberg uncertainty principles.