3949 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 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.
This paper investigates inflation driven by a Gauss-Bonnet term coupled to an inflaton within the Palatini formulation of gravity, demonstrating that while the connection dynamics differ from the metric case, the resulting modifications to the inflaton kinetic term and gravitational wave sector generally mirror those of the Chern-Simons term but with a negative sign, with significant deviations from the metric formulation occurring only when the kinetic term approaches a sign flip.
This paper proposes that the observed binary black hole population consists of three distinct subpopulations arising from isolated binary evolution, dynamical formation in globular clusters, and higher-generation mergers, with their relative abundances estimated at approximately 79%, 14.5%, and 2.5% respectively and evolving over cosmic time.
This paper proposes "topological leptogenesis," a novel mechanism that explains the universe's lepton asymmetry by replacing sterile neutrinos with a gapped topological order sector that cancels the Standard Model's anomaly, allowing topological quantum matter excitations to decay into Standard Model particles via an intermediate gravitational leptogenesis step.
This paper reports the first confident measurement of orbital eccentricity in the neutron star–black hole merger GW200105 using a novel waveform model that incorporates both precession and eccentricity, suggesting a formation channel driven by dynamical interactions rather than isolated binary evolution.
By analyzing the interplay between electric charge and quantum corrections in Reissner-Nordström black holes, this study uses strong-field lensing and Event Horizon Telescope data to constrain the dimensionless quantum parameter to be less than approximately 0.7, thereby establishing a phenomenological limit on Planck-scale spacetime modifications.
This paper demonstrates through closed-form Green's functions and multiple calculation methods that massless particles are not produced in plane gravitational wave spacetime, thereby resolving apparent contradictions with earlier predictions of particle creation based on Bogolyubov coefficients.
This paper utilizes real gravitational-wave data from events like GW230529 and GW190814 to establish novel observational constraints on the fraction and particle mass of dark matter admixed within neutron stars, revealing that while some events are consistent with a dark matter core, others may accommodate a dark matter halo configuration.