3256 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.
Motivated by the Hubble tension, this study utilizes DESI DR2 and ACT DR6 data to constrain the varying electron mass and early dark energy models, finding a slight preference for a varying electron mass while ruling out significant early dark energy contributions, and subsequently identifying distinct inflationary scenarios favored by each model.
This paper derives the explicit trace of field equations for generic higher-derivative gravity theories and establishes a fundamental equality expressing the Lagrangian density as the covariant divergence of a vector field, a result particularly applied to theories constructed from contractions of metric tensors with Riemann tensors and their arbitrary-order covariant derivatives.
This paper investigates massive scalar fields around Kerr black holes in Einstein-Maxwell-Dilaton-Axion theory with perfect fluid dark matter, revealing that while the dilaton parameter enhances superradiance and quasinormal mode frequencies, the perfect fluid dark matter parameter suppresses these effects and plays a dominant stabilizing role in the system.
This paper extends U-dualities in maximally supersymmetric non-chiral supergravity to fermionic degrees of freedom via Spin- and Pin-lifts, utilizing the Swampland Cobordism Conjecture to predict new codimension-two reflection branes that act as charge conjugation symmetries and support specific BPS objects, braiding rules, and bound states.
This paper constrains a Brans-Dicke-like framework where the gravitational constant and speed of light co-vary () using SN Ia, BAO, and CMB data, finding that Pantheon+ combined with DESI strongly favors a variable speed of light at over confidence due to a correlation with , while Union2.1 data suggests no variation.
This paper investigates axial gravitational perturbations of Dymnikova regular black holes using the WKB method with Padé approximants, revealing that while the quantum parameter primarily influences the Hawking temperature, the resulting grey-body factors and absorption cross-sections remain robust and closely resemble the Schwarzschild case, thereby confirming the high-accuracy correspondence between quasinormal modes and transmission coefficients for multipoles .
This study systematically analyzes how a Hernquist dark matter halo alters the optical appearance of a Schwarzschild black hole under three accretion scenarios, revealing that the halo significantly enlarges the photon sphere and suppresses brightness, thereby offering a theoretical framework to constrain dark matter distributions in galactic centers through black hole imaging.
This paper demonstrates that a Random Forest machine learning classifier applied to O3 gravitational-wave data improves candidate detection at low false-positive rates and enables the identification of a new subthreshold astrophysical candidate at GPS time 1240423628.
This paper investigates how detector-based measurements in a CFT induce Lüders state updates, determining their associated boundary space-time regions and corresponding modifications to the bulk gravity state and semiclassical parameters within the AdS/CFT framework.
This paper demonstrates that the symmetries of various 4-dimensional spacetimes, including Taub-NUT, near-horizon extreme Kerr, and swirling universes, are fundamentally interconnected through double Wick rotations, thereby establishing a theory-independent framework where finding solutions in one class automatically yields solutions in the others.