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 introduces Reduced-Order Stochastic Diffraction (ROSD) models, which utilize singular value decomposition of numerical wave-optics simulations to create an efficient, probabilistic framework for describing and detecting microlensing distortions in gravitational waves caused by stellar fields.
This paper classifies 4-dimensional gravitational theories with integrability properties analogous to quasi-topological gravity for a specific set of symmetric metrics, demonstrating that only theories yielding third-order equations can be analytic in the Riemann tensor and constructing unique, regular static black hole solutions with first-order field equations from infinite towers of high-energy curvature corrections.
This study demonstrates that differential rotation in hybrid stars with a first-order deconfinement phase transition can support unique quasi-toroidal configurations with ring-shaped quark cores, while revealing a degeneracy in rotational profiles between models with and without phase transitions that necessitates multi-messenger observations for differentiation.
This paper reviews how one-loop corrections from matter fields during de Sitter inflation differentially affect gravitational wave mode functions, showing that while conformally coupled matter yields only logarithmic enhancements, massless minimally coupled scalars induce a significant shift in the real part of the mode function that can be interpreted as a modification of the inflationary Hubble parameter.
This paper presents the first joint constraints on the sum of neutrino masses and neutrino density isocurvature modes using Planck 2018, ACT DR6, SPT-3G, DESI DR2, and DES Year 5 data, finding that while the inclusion of isocurvature perturbations only marginally weakens the upper mass limits, the tightest bounds are highly sensitive to dark energy models and prior assumptions regarding the neutrino mass hierarchy.
This paper presents the first semi-analytical framework for tidal disruption event rates around spinning Kerr black holes, demonstrating that while spin induces a first-order bias favoring the disruption of retrograde stars, the global event rate remains remarkably insensitive to black hole spin.
This paper introduces a paraxial wavepacket model for collimated gravitational-wave bursts, demonstrating that while the standard plane-wave approximation remains valid for current detectors, incorporating finite transverse structure into third-generation network analyses could significantly enhance detection efficiency by leveraging geometric phase shifts.
This paper introduces a joint model for the gravitational wave background and resolvable supermassive black hole binaries to constrain their population properties using simulated NANOGrav 15-year data, revealing that most active galactic nucleus candidates are in tension with observations while projecting a 5% probability of detecting individual sources in the upcoming 20-year dataset.
This paper demonstrates through end-to-end simulations that adding LIGO-India to the global detector network will significantly accelerate the resolution of the Hubble tension by boosting gravitational wave detections, improving sky localization, and increasing kilonova follow-up rates, potentially reducing the time required to precisely measure the Hubble constant from decades to just a few years.
This paper introduces a novel massive flat-space limit for cosmological correlators that preserves finite internal masses through a double-scaling procedure, deriving a general reduction formula to express these correlators in terms of flat-space amplitudes and applying it to reveal new non-Gaussian bispectrum shapes from heavy particle exchanges that cannot be captured by standard local effective field theory operators.