2649 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 study utilizes fully general relativistic numerical simulations of charged binary black hole mergers to demonstrate that while electric charge significantly alters the inspiral phase, it only mildly affects ringdown mode amplitudes, suggesting that previous estimates of charge detectability were overestimated and highlighting the necessity of including higher modes for future analyses with next-generation detectors.
This paper employs the scalar field as a time variable to deparametrize and nonperturbatively quantize scalar-tensor gravity using loop quantum gravity techniques, revealing that in the resulting Brans-Dicke cosmological model, the classical big bang singularity is resolved and replaced by a quantum bounce.
This paper presents an improved methodology for testing general relativity using gravitational waves, featuring group velocity parametrization and enhanced sampling, which yields tighter constraints on modified dispersion relations and a reduced upper bound on the graviton mass when reanalyzing GWTC-3 events, while finding no evidence for violations of general relativity for negative momentum exponents.
This paper resolves the ambiguity of field space geometry in gravitational effective field theories by developing a frame-covariant framework that interprets conformal frames as distinct foliations of a higher-dimensional auxiliary geometry, thereby demonstrating that key Swampland Distance Conjectures are universal consequences of frame covariance rather than specific quantum gravity constraints.
This paper investigates how a time-dependent Newton constant and non-conserved energy-momentum tensor, constrained by the Bianchi identity and thermodynamic principles, lead to specific power-law relations between and black hole mass that determine the black hole's evaporation behavior and temperature evolution based on the chosen entropy definition.
This paper presents a new family of multi-centered extremal rotating black hole solutions in five-dimensional vacuum Einstein gravity, constructed by promoting harmonic functions of the Myers-Perry solution to multiple sources, which yield smooth, singularity-free spacetimes with bubble-supported binary configurations and no closed timelike curves.
This paper investigates exact static and rotating black string solutions in gravity surrounded by an anisotropic Kiselev fluid, analyzing the effects of the quintessence state parameter and matter-geometry coupling on energy conditions, Hawking radiation, and thermodynamic stability.
This paper demonstrates that while the lowest-order Blandford-Znajek jet power is universal across generic stationary and axisymmetric black-hole spacetimes, the next-leading-order corrections depend on the specific spacetime geometry, offering a potential method to distinguish rapidly rotating black holes through combined measurements of jet luminosity and angular velocity.
This paper investigates the relativistic quantum dynamics of scalar bosons subject to Coulomb-type potentials in a spacetime featuring both cosmic string and global monopole defects within the framework of Rainbow Gravity, deriving bound-state energy spectra that reveal the interplay between topological defects and energy-dependent spacetime deformations.
By employing realistic relativistic mean field equations of state with consistent thermal treatments, this study demonstrates that post-merger gravitational-wave peak frequencies span 2.5 to 4 kHz, thereby highlighting the necessity for broadband observatories with kilohertz sensitivity and validating the KAGRA high-frequency design over its broadband counterpart.