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 proposes a phenomenological framework interpreting dark energy as the intrinsic tension of spacetime, which, through a Dirac--Born--Infeld completion and a late-time hidden symmetry-breaking transition, generates a time-dependent dark energy density with mild low-redshift evolution and a transient crossing of the phantom divide.
This paper extends Plebanski's mapping to encode the Einstein equations in ADM form within a bianisotropic electromagnetic medium by translating gravitational constraints and evolution equations into dynamical conditions on the medium's constitutive parameters, ultimately deriving gravitational-wave analogues as optical perturbations in a vacuum linearization.
This paper establishes the mathematical foundations for deriving first-order constitutive equations of a relativistic charged gas by applying a generalized projection method within the Chapman-Enskog expansion, arguing that the trace-fixed particle frame yields a causal, stable, and strongly hyperbolic fluid theory with frame-independent transport coefficients.
Using updated He-star wind prescriptions in isolated binary evolution models, this study finds that wind mass loss primarily determines the spin of second-born black holes and that neither stable mass transfer nor common-envelope channels produce a correlation between mass ratio and effective inspiral spin, suggesting alternative physical mechanisms are needed to explain the observed weak anti-correlation in GWTC-4.0.
This paper demonstrates the stability of Schwarzschild black hole time-domain waveforms against piecewise step approximations of the Regge-Wheeler potential by interpreting potential differences as environmental perturbations, revealing that broader initial bumps more clearly imprint these small modifications, thus offering a theoretical pathway to probe black hole exterior environments.
This paper employs dynamical systems analysis to demonstrate that an initial population of NS5-brane wrapped strings can resolve the cosmological overshoot problem for the volume modulus by transferring energy to it, while simultaneously predicting a potentially detectable gravitational wave signal from the resulting high energy density of cosmic superstrings during modulus oscillations.
This paper demonstrates that naive fractional calculus models, despite their intrinsic memory features, fail to reproduce the permanent displacement of gravitational-wave memory because their solutions decay to zero at late times, indicating that successful modeling requires embedding fractional kernels directly into General Relativity's flux-balance laws rather than simply modifying field equations or source terms.
This paper applies a scalar-Einstein-Gauss-Bonnet reconstruction procedure to the Yilmaz-Rosen and Janis-Newman-Winicour metrics in four dimensions, revealing that the Yilmaz-Rosen configuration requires a phantom-like scalar field with vanishing potential and violates all energy conditions, while also deriving new exact solutions for the Janis-Newman-Winicour metric.
This paper presents the first analysis of traversable wormhole solutions in Einstein-aether theory, demonstrating that specific choices of aether coupling constants allow these geometries to satisfy null and weak energy conditions throughout the entire spacetime, thereby imposing more stringent constraints on the theory's parameters than previously known.
This paper reformulates the vacuum Einstein constraints using differential forms and demonstrates that for real-analytic metrics, these constraints can be locally reduced to a system of first-order partial differential equations by selecting a specific orthonormal coframe that eliminates second-order terms in the scalar constraint.