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 presents a pedagogical introduction to Gaussian scalar field theory, demonstrating how the entire framework can be derived from the retarded Green function and encapsulated within the Wightman function, thereby offering a formalism well-suited for curved spacetimes and causal sets that allows for the definition of a distinguished vacuum state and a purity condition.
This paper utilizes a combination of "magnetic" and "electric" Ehlers-Harrison transformations on a Minkowski seed to derive a new type D electromagnetic swirling universe and four novel asymptotically nonflat type I spacetimes, providing detailed geometric analyses, singularity checks, and connections to known solutions like the Melvin and Reissner-Nordström-NUT metrics.
This paper investigates non-singular cosmological bouncing solutions in higher-order torsion gravity by reconstructing the gravitational Lagrangian for five distinct bounce scenarios across various matter phases, demonstrating that these models naturally satisfy observational constraints and avoid singularities through geometric mechanisms that violate the null energy condition without requiring ad hoc matter fields.
This paper demonstrates that by extending the vacuum gravity framework with infinite quasi-topological higher curvature corrections, one can construct regular black hole solutions in four dimensions that possess vanishing inner horizon surface gravity, thereby eliminating classical mass inflation instabilities.
This paper defines Carrollian black holes as the limit of Schwarzschild-(A)dS and Schwarzschild-Bach-(A)dS spacetimes, revealing that massive particles exhibit finite or infinite windings near the extremal surface depending on the theory, while the resulting thermodynamics resemble an incompressible system with divergent entropy and a variable specific heat at zero temperature.
This paper demonstrates that the spherically symmetric collapse of a uniform dust star in Quadratic Gravity inevitably leads to horizon formation and a singularity that forms faster than in General Relativity, despite the theory's rich phase space of static solutions.
This paper constructs a non-perturbative Noether realization of asymptotic higher spin symmetries in gravity by introducing a symmetry algebroid that incorporates radiation and demonstrates that the associated charges are conserved in the absence of radiation, provided the symmetry parameters evolve according to equations of motion dual to the asymptotic Einstein equations.
This study evaluates how second-generation Time-Delay Interferometry (TDI) combinations affect the detection of gravitational wave polarizations across LISA, Taiji, and TianQin, revealing that while LISA and Taiji perform best with A and E channels, TianQin uniquely excels in detecting additional polarizations via its X channel.
This study derives grey-body factors for gravitational and electromagnetic perturbations around Gibbons-Maeda-Garfinkle-Horovits-Strominger black holes by leveraging quasinormal mode data, revealing that the dilaton parameter significantly suppresses these factors near extremality and breaks the iso-spectrality between axial and polar perturbation channels.
This paper corrects previous calculations of the primordial bispectrum in single-field inflation by computing second-order slow-roll corrections, revealing that these next-to-leading order terms can be as significant as the leading order results in models like hilltop inflation.