2575 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 that combining future Hz-band Earth-term detections of supermassive black hole binaries with historical nHz-band "gravity echoes" recorded by pulsar timing arrays will create a unique temporal baseline, enabling precise sky localization, direct measurement of long-term inspiral rates, and coherent tracing of post-Newtonian evolution across kiloparsec baselines.
This paper demonstrates that an ultralight vector dark matter field, by breaking spatial isotropy and inducing mixing between scalar and tensor perturbations in a Bianchi I geometry, acts as a source for a stochastic cosmological gravitational wave background, the spectrum of which is computed using a modified version of the CLASS code.
This paper derives exact expressions for the factors in the Hadamard form of the retarded Green function for the Teukolsky equation on Schwarzschild spacetime by utilizing a conformal direct-product metric to obtain a separable direct part and its multipolar modes, ultimately providing an improved representation of the Green function near coincidence for gravitational perturbations.
This paper investigates the late-time evolution of an anisotropic Bianchi-I universe containing radiation and electromagnetic fields within asymptotically safe gravity, revealing that quantum effects soften anisotropy in radiation-dominated scenarios while the presence of a cosmological constant ultimately drives the universe toward an isotropic de Sitter phase, whereas its absence leads to a persistent Kasner-type anisotropic regime.
This paper presents a unified relativistic perturbation framework to calculate frequency shifts in gravitational waves emitted by axion clouds around rotating black holes, accounting for self-interaction effects that populate multiple superradiant modes and revising the treatment of self-gravity to improve predictions for next-generation observations.
This paper extends the Landau theory analysis of scalarization phase transitions in neutron stars to include general linear and quadratic couplings and stellar rotation, demonstrating that the former reveals overlooked solution branches while the latter primarily shifts transition masses to higher values without altering the qualitative phase structure.
This study demonstrates that Myrzakulov-type gravity with a Chaplygin gas equation of state can generate a stable, non-singular cosmic bounce driven by negative quadratic trace coupling () that violates the Null Energy Condition through geometric repulsion, thereby offering a viable alternative to the Big Bang singularity while satisfying causality and stability constraints.
This paper proposes a model in 2+1 dimensions where the black hole horizon is composed of quantized elementary lengths, enabling a length ensemble formulation that directly derives the Hawking black body spectrum and its modified temperature for a local observer via the Tolman factor.
This paper investigates how gravitational inhomogeneity affects transport phenomena in a system of massless Dirac fermions coupled to both Maxwell and dark photon fields, revealing that the resulting currents are proportional to beta functions and predicting specific corrections to scale conductivities in both the visible and dark sectors.
This paper proposes and tests a family of phenomenological cosmological models featuring an interacting dark sector modulated by a sparseness scale parameter, demonstrating through phase-space analysis and Bayesian constraints from multiple observational datasets that a nonzero sparseness scale is favored at over 95% confidence, thereby supporting its role in bounding energy exchange and preventing phantom crossing.