2693 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 novel method to measure the Hubble constant using the stochastic gravitational-wave background from binary black hole mergers as a "stochastic siren," demonstrating that combining this approach with resolved merger data can improve measurement precision and potentially help resolve the Hubble tension.
This paper utilizes an open quantum system formalism to calculate the inflaton four-point correlation function in axion inflation, demonstrating that the derived parity-odd expansion coefficients in the large limit not only confirm parity violation but also align with recent observational data from galaxy surveys.
This paper conducts a stability analysis of four gravity models within a Bianchi-I anisotropic universe, identifying various cosmological fixed points that explain the transition from early inflation to late-time acceleration while predicting scenarios where initial anisotropy decays into a homogeneous, isotropic future.
This paper investigates how theoretical priors and the choice of parametrisation significantly influence observational constraints on dark energy and modified gravity, comparing phenomenological and effective field theory approaches to distinguish physical models from unphysical ones.
By applying the full parameterized post-Newtonian formalism to scale-dependent gravity, this study reveals a new first-order potential that modifies pressure and internal energy definitions but leaves center-of-mass orbits and Solar System constraints unaffected.
While shift-symmetric Horndeski and generalized Proca theories struggle to accommodate the phantom-divide crossing suggested by DESI, CMB, and SN Ia data without theoretical pathologies, the authors demonstrate that breaking shift symmetry in Horndeski theories enables a stable model with a scalar potential and Galileon interactions that successfully realizes this transition at low redshifts.
This paper demonstrates that a single strongly lensed multi-messenger event can constrain the graviton mass to eV/c using time-delay measurements, offering a model-independent test that significantly outperforms constraints derived from image magnification.
This paper demonstrates that while spin-curvature coupling quantitatively shifts the orbital parameters of spinning test particles in black hole spacetimes, the qualitative global structure of timelike circular orbits remains topologically invariant, characterized by robust winding numbers determined solely by the spacetime geometry rather than the particle's spin.
This paper proposes a modified hybrid inflation model where a "softened" stiff period driven by the waterfall field resolves the Big Bang Nucleosynthesis constraints on primordial gravitational wave energy density while still producing a characteristic, observable gravitational wave spectrum.
This paper argues that holographic consistency conditions, such as the convexity of the CFT spectrum and the averaged null energy condition, provide a geometric realization of Swampland constraints on quantum gravity, suggesting that these conjectures are manifestations of deeper holographic principles.