3255 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 demonstrates that the state-counting interpretation of black hole entropy and the unitary Page curve for Hawking radiation are equivalent within the gravity path integral framework, showing that the information loss paradox is resolved by any microstate basis compatible with black hole entropy via a convex optimization problem for von Neumann entropy.
This study reveals that while node-based reconstructions and smooth dark energy equation-of-state parametrizations yield consistent late-time expansion histories, they exhibit a significant discrepancy in deceleration at intermediate redshifts (), suggesting that standard low-dimensional parametrizations may fail to faithfully capture localized kinematic features permitted by current late-universe data despite being favored by Bayesian evidence.
This paper proposes and validates non-polynomial quasi-topological gravity as a theoretically consistent, higher-curvature extension of general relativity that successfully reproduces the standard thermal history of the universe and provides a dynamical dark energy explanation for late-time cosmic acceleration, remaining fully compatible with current observational data and statistically competitive with the CDM model.
This paper demonstrates that extending the Tolman-Oppenheimer-Volkoff equations to include covariant energy exchange between matter and vacuum allows ultra-compact stellar objects to bypass the classical Buchdahl stability limit by maintaining finite central pressures through specific interaction models.
This paper computes the energy density of scalar-tensor-induced gravitational waves (STGWs) generated during early matter-dominated and radiation-dominated eras, demonstrating that while these signals dilute in a purely matter-dominated universe, they remain viable and potentially dominant contributors to the nanohertz stochastic gravitational wave background observed by NANOGrav and detectable by the future Square Kilometre Array.
This paper presents a systematic calculation of non-dissipative, quantum-origin second-order hydrodynamic corrections to the stress-energy tensor and currents for free boson and Dirac fields in thermal vorticity, deriving their Kubo formulae via equilibrium correlators and demonstrating that the axial current receives vorticity-proportional corrections independent of anomalous terms.
This paper validates the accuracy of prior-informed Fisher-matrix analyses by comparing them against real gravitational-wave data from GWTCs, demonstrating that while priors are crucial for handling parameter degeneracies, the Fisher approximation remains a reliable tool for future Einstein Telescope science-case studies.
This paper provides an overview of the de Broglie-Bohm pilot-wave formulation of quantum mechanics, with a specific focus on its applications in field theory, high-energy physics, gravitation, and cosmology.
The paper demonstrates that the standard low-energy effective field theory of quantum gravity predicts unobservably small vacuum fluctuations in interferometers, implying that any future detection of large gravitationally-induced length variations would signal a fundamental breakdown of this theory.
This paper presents a new general solution for gravitational field equations in quantum fluctuation modified gravity that encompasses various Kiselev black hole configurations, while analyzing their energy conditions, Hawking temperatures, and constraints on metric fluctuation parameters.