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 introduces a new non-parametric method to constrain the ratio between gravitational-wave and electromagnetic-wave luminosity distances, which, when applied to GWTC-3 binary black hole merger data, yields results consistent with General Relativity and previous parametric analyses.
By developing a gravitational-wave waveform model that incorporates a slowly varying gravitational constant and applying it to a joint multi-messenger analysis of the binary neutron star merger GW170817, this study finds no evidence for temporal variation in and establishes the most stringent constraints to date on its fractional time derivative, thereby validating the strong equivalence principle in the relativistic regime.
This paper derives exact quasinormal modes for massive scalar, fermionic, and vector perturbations around a rotating BTZ-like black hole in Einstein-bumblebee gravity, revealing that the Lorentz symmetry breaking parameter slows field decay by affecting only the imaginary parts of the frequencies while preserving the standard BTZ real parts and confirming the validity of the AdS/CFT correspondence through universal conformal weights.
This paper investigates a density-driven interacting dark energy model within a conformally coupled scalar-tensor framework, finding that current cosmological data show no significant preference over CDM and constrain the model to a hierarchical regime where the scalar field remains heavier than the Hubble scale, with the choice of a fixed versus variable activation index significantly affecting the posterior parameter constraints.
This paper demonstrates that the wavefunction of the universe for conformally coupled scalars in power-law FRW cosmologies satisfies a graphical coaction that reveals its complete analytic structure through acyclic minors of Feynman graphs, thereby reproducing known kinematic flows and simplifying the extraction of discontinuities across all particle multiplicities and loop orders.
This paper demonstrates that all planar black holes conformal to a Painlevé–Gullstrand line element can be realized as analogue metrics by constructing an explicit Lagrangian, while also introducing a concept of holographic entanglement entropy valid for arbitrary conformal and blackening factors.
This paper investigates primordial black hole formation during an early matter-dominated era, concluding that despite shape-dependent threshold variations, the required large amplitude of primordial fluctuations makes this mechanism barely more efficient than in radiation domination and predicts a slightly larger but still small dimensionless spin parameter.
This study employs Bayesian inference on various cosmological datasets to demonstrate that bulk viscous cold dark matter models, while thermodynamically consistent and offering partial alleviation of the Hubble tension, ultimately fail to resolve the discrepancy or outperform the standard CDM model.
This paper investigates the cosmological expansion of the universe within the framework of gravity using the specific model , demonstrating that while the model can fit Type Ia supernovae data for certain parameter ranges, it performs significantly worse than the standard cosmological model as the exponent approaches zero.
This paper investigates FLRW cosmology in symmetric teleparallel gravity with a nonminimal dark matter coupling, demonstrating that the noncoincidence gauge enables a multi-scalar field representation where the coupling facilitates a viable matter-dominated era and late-time acceleration, with the de Sitter solution emerging as the unique future attractor for power-law theories.