2554 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 quasinormal modes of tensor perturbations in Maeda-Dadhich Kaluza-Klein black holes within Einstein-Gauss-Bonnet gravity, utilizing the asymptotic iteration and numerical integration methods to reveal how six specific parameters influence the frequencies while finding that the dimension of the compactified space has no significant impact on the modes' lifetime.
This paper introduces a new, fully analytic weak-signal approximation of the Bayes factor for continuous gravitational waves that, by modeling the amplitude prior as a half-Gaussian distribution, achieves computational efficiency comparable to the -statistic while demonstrating state-of-the-art or improved sensitivity across a wide range of coherent and semi-coherent search segment lengths.
This paper establishes a universal quantum limit framework for detecting ultrahigh-frequency gravitational waves, demonstrating that while kHz-MHz backgrounds are theoretically observable, higher-frequency signals fall below this fundamental bound, thereby guiding future detector designs for probing early universe physics.
This paper demonstrates that while quadratic polynomial inflation struggles to accommodate recent ACT data, higher-order models (specifically cubic to quintic) not only fit the observations but also offer a unified framework where the quintic potential simultaneously explains CMB measurements, triggers primordial black hole formation, and generates scalar-induced gravitational waves.
Using worldline quantum field theory and modern diagrammatic techniques, this paper derives spinning black hole scattering trajectories up to quadratic order in spins and establishes a new framework for computing radiated angular momentum up to 2PM order, thereby advancing high-precision analytical gravitational wave physics.
This paper presents a background-independent Hamiltonian analysis of electrodynamics coupled to fermions and gravity using Ashtekar-Barbero variables in the time gauge, deriving the corresponding constraints and equations of motion while verifying their consistency with standard Dirac and Maxwell equations and analyzing parity transformation to establish a foundation for loop or polymer quantization.
The paper demonstrates that while infra-red loop corrections in quadratic gravity are gauge and parameterization dependent, genuine physical corrections exist that are process-specific and cannot be interpreted as a running of couplings, while also confirming that the theory's ghost does not violate positivity bounds.
This paper establishes the first fully nonlinear causality constraints for Israel-Stewart theory with energy and number diffusion in 3+1 dimensions, revealing distinct physical behaviors in Landau and Eckart frames that are missed by linearized approaches and demonstrating that these constraints allow for spacelike baryon currents in the Landau frame while preserving the dominant energy condition in the Eckart frame.
This paper investigates the accretion of a collisionless relativistic gas by a rotating Kerr black hole, deriving closed integral expressions for physical observables and demonstrating that while black hole rotation significantly reduces the angular momentum accretion rate, it exerts a smaller, analytically predictable influence on mass and energy accretion rates.
By integrating gravitational-wave, gamma-ray burst, and stellar abundance data within a unified likelihood framework, this study demonstrates that neither neutron star-black hole nor fast-merging binary neutron star mergers can serve as the dominant additional source of Galactic r-process elements, thereby confirming the necessity of non-merger production channels.