3191 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 and analyzes the CDM model, which introduces a positive barotropic fluid to modify the early expansion rate, demonstrating that this alternative to Early Dark Energy can effectively alleviate the tension while remaining consistent with current cosmological observations.
This paper demonstrates that spontaneous Lorentz symmetry breaking in a rotating black hole creates macroscopic optical nonreciprocity, causing the black hole's shadow to morph into a distinct teardrop shape when the source and observer are swapped, effectively turning the black hole into a cosmic-scale optical diode.
This paper investigates slowly rotating traversable wormholes supported by three holographic dark energy models (Rényi, mixed, and Moradpour) to analyze how their distinct energy density profiles and redshift functions influence photon dynamics, null geodesics, and the resulting shadow morphology, revealing that Rényi-supported wormholes produce smaller, asymmetric shadows while mixed and Moradpour models yield larger, nearly circular silhouettes.
This paper demonstrates that even when classical and quantum dynamics are aligned at a specific moment during inflation, their correlation functions diverge exponentially by the end of inflation due to interactions, a difference illustrated through the bispectrum and tensor power spectrum that also clarifies the absence of poles in the scalar bispectrum from finite-time classical evolution.
This paper establishes new area bounds for general closed marginally trapped surfaces that depend on Einstein tensor components and stability parameters, revealing that these bounds are realized in "ultra-massive" spacetimes where the entire external region collapses without an event horizon, a phenomenon occurring for both positive and non-positive cosmological constants under sufficient energy-momentum conditions.
This paper presents lecture notes on the physics of gravitational waves, designed for graduate students with a background in general relativity, that prioritize deriving fundamental results from first principles over discussing astrophysical applications.
This paper computes the conservative tidal dynamics and ten conserved quantities for spinless two-body systems at next-to-next-to leading post-Newtonian order in massless scalar-tensor theories and Einstein-scalar-Gauss-Bonnet gravity, utilizing both Fokker Lagrangian and effective field theory approaches to support future gravitational wave detector science cases.
This study demonstrates that while Hawking radiation and spacetime curvature degrade entanglement near Schwarzschild and GHS Dilaton black holes, quantum teleportation fidelity remains robustly above the classical threshold for bipartite channels derived from W-class states but not for those derived from GHZ states.
This paper generalizes the conformal form-invariance of scalar-tensor gravity to include matter couplings, arguing that the long-standing "conformal frame issue" stems from neglecting the transformation of field-dependent parameters and the associated Ward identity, and resolves it by distinguishing between passive and active conformal transformations to establish the latter as the physically meaningful framework.
This paper critically reviews the conformal form-invariant parametrization of scalar-tensor gravity theories to determine its distinctiveness from existing frameworks and to verify the universality of the claim that their classical physical predictions are conformal-frame invariant.