3826 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 novel method based on quasi-invertible transformations from the comoving frame to derive a simplified characteristic decomposition for relativistic hydrodynamics, including a new result for fluids in nuclear statistical equilibrium, thereby laying the groundwork for applying full-wave Riemann solvers in future GRMHD simulations.
This paper derives the characteristic decomposition for General Relativistic Magnetohydrodynamics (GRMHD) in the simulation's coordinate frame using conserved variables by applying quasi-invertible transformations, thereby enabling the use of highly accurate full-wave Riemann solvers with a simpler formulation than previously attempted.
This paper refines the theoretical upper bound on the central pressure-to-energy density ratio in neutron stars to approximately 0.385 by combining causality constraints with mass-sphere stability conditions within the IPAD-TOV framework, establishing a robust, EOS-insensitive probe for the microphysics of cold superdense matter.
This paper investigates how potential deformations in General Relativity and Horava-Lifshitz gravity can mimic dark matter effects, demonstrating that while the former fails to produce flat rotation curves due to pressure anisotropy, the latter offers a controlled mechanism for generating positive dark matter density in restricted LTB backgrounds that smoothly recovers General Relativity.
Using the Effective Field Theory of inflation, this paper demonstrates that primordial non-Gaussianities prevent inflationary perturbations from fully classicalizing on super-Hubble scales by generating a non-positive Wigner function with growing interference fringes, thereby proving that quantum effects can persist at late times despite the standard assumption that squeezing ensures classicality.
This paper proposes and analyzes a practical implementation using superconducting fluxonium circuits to detect the timelike Unruh effect by modulating an excited-state transition frequency to accumulate a geometric phase, achieving a three-order-of-magnitude sensitivity enhancement over traditional detectors.
This paper demonstrates that the degradation of multipartite entanglement under relativistic acceleration depends critically on the network's topology, revealing that accelerating a peripheral qubit in a three-qubit Star state induces unique entanglement revivals and robustness patterns distinct from those observed when the central qubit accelerates.
This paper establishes a fundamental connection between the thermal operator product expansion (OPE) and quasinormal modes (QNM) in large- CFTs by demonstrating their overlapping convergence in the complex time plane, thereby deriving new analytic results for QNM asymptotics, numerical methods to extract low-overtone QNMs from OPE data, and sum rules that enable a new thermal bootstrap program where these two descriptions mutually constrain each other.
This paper proposes that classical gravitational waves, when treated as coherent states of quantized gravitons, can decay into photon pairs or light particles—a quantum process forbidden classically but enhanced by graviton number—thereby offering a novel detection method and enabling new cosmological constraints through the resulting photon injection.
This paper demonstrates that while a self-gravitating accretion disk significantly amplifies the tidal response of Schwarzschild-like exotic compact objects, the characteristic logarithmic dependence on compactness remains intact, preserving the potential to distinguish horizonless objects from black holes in gravitational-wave observations.