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.
This paper demonstrates that while a specific exponential deformation of the Starobinsky model cannot support a positive-curvature vacuum bounce on its own, a minimal extension with an added constant term successfully realizes a stable, nonsingular cosmological bounce free of ghost and tachyonic instabilities, with well-behaved scalar and tensor perturbations in the Einstein frame.
This paper proposes a cavity-QED framework that breaks translational symmetry to enable resonant photon-graviton coupling, revealing that while classical gravitational waves induce exponential photon amplification, quantized gravitons lead to saturation and entanglement, thereby offering a pathway to probe the quantum nature of gravitational waves.
This paper establishes a robust analytical and numerical link between black hole shadow radii and quasinormal mode frequencies in Scalar-Tensor-Vector Gravity coupled with Perfect Fluid Dark Matter, demonstrating that both phenomena are dual observational signatures of the unstable photon orbit that can be used to simultaneously constrain modified gravity and dark matter parameters in the strong-field regime.
This paper analytically derives secular changes in orbital parameters for general bound orbits in Kerr spacetime up to the 6th post-Newtonian order and 16th eccentricity order, validates these against numerical results, and develops efficient hybrid approximations to support fast adiabatic inspiral and waveform modeling for space-based gravitational wave detectors like LISA.
This paper investigates the quasinormal modes of static, spherically symmetric black holes influenced by both Kalb-Ramond fields and perfect fluid dark matter, revealing a unique "stiffening" effect where increasing these parameters raises oscillation frequencies, thereby offering a potential observational method to distinguish coupled dark matter models from traditional ones using Event Horizon Telescope data.
This paper investigates gravitational wave polarization and stability in Weyl geometry gravity, revealing that while tensor and vector sectors are stable with standard propagation, the scalar sector exhibits superluminal propagation and an Ostrogradsky ghost instability driven by the background Weyl gauge field.
This paper presents a closed-form analytic model of a flat-spacetime accelerating boundary that mimics Hawking-type emission with infinite asymptotic acceleration yet finite total radiated energy, unifying the study of scattering symmetry, horizon formation, and the distinction between local energy flux and global particle production to reveal a hybrid of normal and extremal black hole properties.
This paper demonstrates that for a uniformly accelerating observer in Minkowski space, the evolution of incoming light rays (skies) can be mapped via a hyperbolic hodograph transform to a thermodynamic phase space, where the associated generating functions yield an effective temperature proportional to acceleration, thereby establishing a geometric link between relativistic sky dynamics and equilibrium thermodynamics.
This paper investigates the dynamics of spinning test particles around Einstein-geometric Proca Anti-de Sitter compact objects using the Mathisson-Papapetrou-Dixon equations, revealing how modified gravity parameters and spin effects influence orbital stability, innermost stable circular orbits, and the efficiency of particle collisions as high-energy accelerators.
This paper investigates wave equations on arbitrary-dimensional plane wave spacetimes by unifying Ward's progressing-wave representation, Fourier analysis of the associated Heisenberg group, and the Schrödinger propagator, demonstrating how a conformal tensor encoding null-cone geometry simultaneously governs the group's isometric action and the evolution of initial data through a framework involving Lagrangian delta distributions, Maslov phases, and Weil representation theory.