2615 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.
Using the effective field theory of inflationary fluctuations, this paper explicitly proves for the first time that the renormalized one-loop power spectrum of the primordial curvature perturbation freezes exactly on super-horizon scales, thereby confirming the quantum-level validity of the conservation law essential for inflationary predictions.
This paper analytically and numerically characterizes the 2PN-order orbital precessions of S-stars induced by the spin and quadrupole moment of Sgr A*, providing theoretical expressions and observer-independent insights to facilitate future constraints on the black hole's properties using GRAVITY+ observations.
SymBoltz.jl is a new Julia package that provides a symbolic-numeric, approximation-free, and fully differentiable solver for linear Einstein-Boltzmann equations, offering exact derivatives and flexible model construction while maintaining performance comparable to existing approximation-based codes.
This paper formulates a stochastic generalization of the Schwinger effect to compute vacuum decay rates and particle number densities in transient, inhomogeneous, and fluctuating gauge-field backgrounds, providing closed-form analytical expressions for scalar and fermionic cases with applications to cosmological and astrophysical scenarios.
This paper establishes a definition of quasi-local energy for initial data sets with an umbilic second fundamental form in an expanding de Sitter background and proves its positivity for certain bounded values of the cosmological constant by adapting the Liu-Yau energy framework.
This paper investigates the impact of Barrow's fractal entropy parameter on the Joule-Thomson expansion and inversion temperature of quantum-corrected AdS-Reissner-Nordström black holes in Kiselev spacetime, utilizing numerical solutions to analyze temperature-pressure relationships and isenthalpic curves.
This paper investigates the non-Abelian extension of ModMax electrodynamics by demonstrating the existence of self-dual instantons in various curved backgrounds, constructing multi-instanton solutions through perturbative methods, and deriving new gravitating configurations such as Euclidean wormholes when coupled to gravity.
This paper presents a unified exact solution to the relativistic Boltzmann equation for a boost-invariant conformal gas on across all constant-curvature slicings, which reproduces known Bjorken and Gubser flows while introducing a novel analytic "Grozdanov flow" for hyperbolic foliations that naturally encompasses both hydrodynamic and free-streaming regimes.
This paper demonstrates that the propagator of a Hawking particle in the far-horizon region of Schwarzschild spacetime, derived using quantum field theory in curved spacetime, differs from the result obtained via the path-integral formalism, thereby highlighting a theoretical discrepancy between the standard description of high-energy quantum fields in curved spacetime and the low-energy quantum mechanical phenomena observed in Earth's gravitational field.
This paper demonstrates that time-dependent string compactifications can satisfy the higher-dimensional Null Energy Condition required by worldsheet symmetry while allowing the lower-dimensional effective description to violate it, thereby enabling bouncing cosmologies and scale-separated solutions.