3158 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 establishes that the Penrose limit of a Lorentzian metric along a null geodesic is an intrinsic geometric object defined on a weighted associated-graded model determined by the null filtration, where the standard dilation scaling reduces coordinate freedom to a residual weighted gauge group that canonically identifies the limit with a homogeneous plane-wave germ via a tautological soldering over the jet bundle of contact scales.
This paper investigates the electromagnetic vacuum characteristics induced by a brane intersecting the AdS boundary under perfect electric and magnetic boundary conditions, deriving explicit expressions for Wightman functions and demonstrating that the resulting vacuum energy density and stress components exhibit distinct sign behaviors and non-vanishing properties unique to the AdS spacetime geometry.
This paper demonstrates that within a Poincaré-invariant field theory on Minkowski spacetime, the requirement of total energy-momentum conservation uniquely determines the field Lagrangian density for a symmetric rank-2 tensor field to be proportional to the Einstein Lagrangian density.
This paper introduces a methodology for estimating the angular power spectrum of anisotropic stochastic gravitational-wave backgrounds by operating directly in the "dirty map" space to avoid Fisher matrix inversion biases, demonstrating its ability to reliably recover model parameters up to spherical harmonic order in Advanced LIGO noise simulations for both auto- and cross-correlation searches.
This paper proposes that holographic spacetime emerges as a Wasserstein space through optimal transport of quantum state distributions, demonstrating that the 1-Wasserstein distance between Husimi Q-representations serves as a generalized Krylov complexity to reproduce black hole geometries in harmonic oscillators and SYK models under the manifold hypothesis.
This paper investigates a cosmological model based on fractional entropy applied to the apparent horizon, demonstrating that the model remains thermodynamically stable during late-time acceleration and that observational data from Cosmic Chronometers, Pantheon+SH0ES, and DESI DR2 BAO favor a fractional parameter close to the General Relativity limit while revealing a distinct modulation of the Hubble constant and matter density as the parameter varies.
This study utilizes the latest LIGO-Virgo-KAGRA gravitational wave data and a comprehensive gamma-ray burst catalog to test the cosmological principle, finding no significant evidence for anisotropy and thus supporting the hypothesis that the Universe is statistically isotropic on large scales.
This paper proposes and validates a clock noise cancellation scheme for space-borne gravitational-wave telescopes using heterodyne links between optical cavities, which eliminates clock jitter by combining positive and negative beat-note signals to achieve the required sensitivity in the decihertz band without additional modulation.
This paper argues that by seriously analyzing the structural similarities between black hole paradoxes and Extended Wigner's Friend scenarios, the former supports interpretations of the latter that rely on intrinsic relationality and retrocausality rather than emergent relationality.
This paper introduces a systematic prolongation procedure for Killing two-tensors, particularly in locally symmetric spaces, and applies it to clarify the natural quadratic mapping from Killing fields to Killing two-tensors on irreducible locally symmetric spaces of compact type.