2593 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 targeted search method for supermassive black hole binaries using Pulsar Timing Arrays to overcome sky localization limitations, demonstrating that the Chinese Pulsar Timing Array alone could measure the Hubble constant with 2 km/s/Mpc precision to help resolve the Hubble tension.
This paper proposes a quantum mechanical model of black hole decay via fuzzy sphere tunneling mediated by monopole zero modes, demonstrating that this unitary process reproduces the semi-classical Hawking radiation rate and Boltzmann distribution while offering a framework to determine the full wave function of the emitted quanta.
This paper establishes a consistent renormalization framework within the Effective Field Theory of inflation that successfully cancels ultraviolet divergences and tadpoles for scale-dependent backgrounds with strong de Sitter symmetry breaking, demonstrating that the renormalized one-loop power spectrum vanishes at both large and small scales for resonant and sharp features while preserving perturbativity.
This paper proves that -dimensional solutions to the Einstein scalar-field Vlasov system, initially close to FLRW spacetimes on closed surfaces of arbitrary genus, exhibit stable Big Bang singularities with quiescent, velocity-term-dominated asymptotics and -inextendibility, thereby establishing the Strong Cosmic Censorship conjecture for a corresponding class of polarized -symmetric vacuum solutions.
This paper introduces "cosmological dressing rules" that transform flat space Feynman diagrams into in-in correlators for conformally coupled and massless scalar theories in four-dimensional de Sitter space, thereby revealing a hidden simplicity linked to flat space scattering amplitudes while correctly reproducing infrared divergences predicted by the Schwinger-Keldysh formalism.
Motivated by recent DESI DR2 results suggesting evolving dark energy, this study analyzes spatially flat FLRW cosmological models with non-minimally coupled scalar fields in the Einstein frame, employing dynamical system methods to examine the evolution and stability of five specific scalar field models under various coupling parameters to understand energy transfer between the scalar sector and matter.
This paper proposes using quantum-state discrimination strategies on massive quantum clocks, such as thorium nuclei, within the Parametrized Post-Newtonian formalism to theoretically demonstrate that different metric theories of gravity can be distinguished with high certainty, potentially even with a single detection event or a small ensemble of clocks.
This paper investigates cosmological models incorporating reversible and irreversible thermodynamic processes, specifically gravitationally induced matter creation/annihilation and energy exchange with the cosmic horizon, finding that while these thermodynamically motivated interactions do not resolve the Hubble tension when local SH0ES measurements are included, they offer a dynamic dark energy alternative consistent with other cosmological datasets.
Using DESI DR2 BAO measurements, this paper constrains a model of interacting dark matter and radiation that induces bulk viscosity to resolve cosmic tensions, finding that the data disfavors such interactions prior to recombination and rules out the model as a solution to the Hubble tension.
This paper investigates how dark dipole radiation from eccentric supermassive black hole binaries can accelerate their inspiral and alter the low-frequency stochastic gravitational-wave background, finding that while it cannot fully resolve the final-parsec problem, it remains detectable through Bayesian analysis of current pulsar timing array data.