2593 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 generalizes the Aichelburg-Sexl stress-energy-momentum tensor for massless particles to include angular velocity using tensorial spherical harmonics and explores the potential manifestation of photon self-force as a frequency shift.
This paper investigates the thermodynamics of -dimensional Gauss-Bonnet black holes with Barrow entropy, revealing that while the coupling and fractal factor stabilize large five-dimensional black holes, they fail to alter the inevitable evaporation of six- and seven-dimensional counterparts due to persistently negative heat capacities.
This paper derives and verifies an exact, closed-form analytical formula for gravitational Faraday rotation measured by Eulerian observers within the ADM split of Kerr spacetime, offering a singularity-free method to study light transits through the ergosphere that overcomes limitations of Boyer-Lindquist coordinates.
This paper reports the successful realization of a 50-km fiber Mach-Zehnder interferometer operating at the single-photon level that achieves sufficient phase sensitivity to detect modulated gravity-induced signals, thereby establishing a new milestone for testing quantum phenomena within general relativistic frameworks in a local laboratory setting.
This paper demonstrates that the Smeared Null Energy Condition (SNEC) imposes significant constraints on the viability of Genesis cosmology models within generalized Galileon theories, establishing SNEC as a powerful tool for limiting nonsingular cosmological scenarios that rely on null energy condition violations.
This paper demonstrates that the emergence of a robust cosmological arrow of time, distinguishing expanding from contracting histories, arises not merely from inflationary squeezing or boundary conditions but from environment-induced decoherence of superhorizon curvature modes, which irreversibly suppresses interference between macroscopically distinct branches within approximately 0.5 e-folds.
This paper establishes an axiomatic framework for the continuum limit of spin foam amplitudes, demonstrating that while strong convergence inevitably leads to a topological theory, a distributional approach inspired by Refined Algebraic Quantisation successfully yields a well-defined physical Hilbert space and interprets the gravitational path integral as a rigging map.
This paper demonstrates that in Einstein-Nonlinear-Electrodynamics models depending on two electromagnetic invariants, vacuum birefringence causes photons to follow two distinct paths, resulting in a single black hole casting two separate shadows and allowing researchers to constrain the charge-to-mass ratio of Sagittarius A* based on this phenomenon.
This paper constructs a Majorana-based , superspace formalism for the Kalb-Ramond topological term that reveals new bosonic and fermionic contributions, including a supersymmetric Chern-Simons-like coupling, which upon compactification shifts the Kaluza-Klein mass spectrum and offers novel implications for torsion phenomenology in Randall-Sundrum models.
This paper presents the first fully analytical single-field inflation model featuring a smooth transition from slow-roll to ultra-slow-roll phases, achieved by introducing a time-dependent effective mass term that maintains a continuously varying second slow-roll parameter while enabling precise tracking of the curvature power spectrum's parameter dependence.