2615 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 a multi-field model within Loop Quantum Cosmology using a polymerized spacetime framework to derive quantum-corrected Friedmann equations, numerically analyzing the transition from a quantum bounce to slow-roll inflation and assessing the model's viability through stability and dynamical systems analyses.
This paper demonstrates that within Einstein gravity coupled to nonlinear electrodynamics and a phantom scalar field, the Simpson-Visser regular black hole possesses a vanishing thermodynamic mass due to boundary contributions, yet remains thermodynamically less favorable than its singular counterpart when compared under identical thermal and magnetic conditions.
This paper presents a unified analysis demonstrating that continuous rotational and electromagnetic energy extraction can drive over-extremal Kerr, Reissner-Nordström, and Kerr-Newman naked singularities toward the extremal bound over astrophysical timescales, potentially leading to horizon formation as a stabilizing mechanism.
This paper demonstrates that within the most general formulation of gravity with independent metric and connection, a unique naturally light vector or scalar distortion field emerges as a dynamical degree of freedom, notably predicting a light scalar particle that mixes with the Higgs boson.
This paper presents a dark fluid model described as a non-viscous, non-relativistic, rotating, and self-gravitating fluid with spherical symmetry and a polytropic equation of state, which is solved using a self-similar time-dependent ansatz to derive new solutions consistent with the Newtonian cosmological framework that can describe the transition from normal matter to dark energy on cosmological scales.
This study forecasts that the Euclid mission will significantly constrain the Hu-Sawicki modified gravity parameter , achieving approximately 1% precision when combining spectroscopic and photometric probes and enabling the distinction of these models from the standard CDM cosmology at greater than 3 confidence.
This paper analyzes the orbital motion of a test particle in the McVittie spacetime using local coordinates and osculating elements to demonstrate that while cosmological expansion does not affect the orbit's size up to second order, it induces a time-dependent precession and alters the mean orbital frequency, with the precession direction determined by the Hubble and deceleration parameters.
This paper generalizes a recent geometric approach for studying massive particle surfaces to stationary spacetimes by utilizing a projected 2-dimensional Riemannian metric to characterize null and timelike trajectories via intrinsic curvatures, thereby enabling the analysis of black hole shadows in non-asymptotically flat solutions like Kerr and Kerr-(A)dS.
This paper demonstrates that within the Effective Field Theory of inflation, one-loop gravitational corrections to primordial power spectra can be fully renormalized using dimensional regularization, resulting in exactly conserved scalar and tensor spectra on super-horizon scales and proving that propagation speeds remain immune to radiative corrections from gravitational nonlinearities.
This paper establishes a correspondence between the gravitational phase space at null infinity and near a black hole horizon, identifying celestial symmetries in the latter's subleading phase space to reveal an infinite tower of conserved charges and new gravitational observables.