3884 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 an exact analytic metric describing rotating black holes embedded in dark matter halos with central density spikes, which is asymptotically flat, intrinsically anisotropic due to the spike-induced discontinuity, and generalizes previous spherically symmetric models to the rotating case.
This paper proposes a unified cosmological model where two scalar fields operate simultaneously, with one driving the universe's cyclic expansion and contraction while the other triggers a recurring epoch of inflationary expansion following each cosmological bounce.
This paper demonstrates that the Links--Gould polynomial successfully detects causality in all known examples where the Alexander--Conway polynomial fails, specifically by distinguishing Allen--Swenberg links from causally unrelated events, thereby suggesting it may fully capture causal relationships in (2+1)-dimensional spacetimes.
This paper constructs a static, spherically symmetric regular black hole featuring a Minkowski core and a degenerate inner horizon, which ensures sub-Planckian curvature in the large-mass regime and suppresses exponential mass inflation to a power-law growth, resulting in a finite internal mass at late times.
This paper proposes a geodesic interferometer scheme using a single photon to estimate the specific angular momentum of a Kerr spacetime by analyzing the interferometric visibility resulting from the combined effects of gravitational time delay and Wigner-induced polarization rotation.
Using LIGO-Virgo-KAGRA O4a data, this study establishes the strongest constraints to date on the abundance of primordial black holes in the mass range, finding no compelling evidence for their contribution to observed gravitational wave events despite allowing for a subset of cataloged mergers to be primordial in origin.
This paper demonstrates that for a CFT on a flat open solid torus, the two-point function and disjoint entanglement entropy are exactly paired with finite bulk geodesics and entanglement wedge cross-sections, respectively, without requiring large , strong coupling, or heavy operators, thereby revealing a broader exact-pair structure in AdS/CFT beyond standard singular limits.
This paper derives an analytical expression for the quantum tunneling probability of a closed universe's nucleation within a fixed-interval minisuperspace framework, providing a self-consistent semiclassical estimate that includes both exponential suppression and the exact Gaussian prefactor arising from quadratic fluctuations around the instanton.
This paper utilizes the EFT of inflation in the decoupling limit to derive a non-perturbative Hamiltonian for single-field ultra slow-roll (USR) inflation, revealing that instantaneous transitions to the slow-roll phase cause higher-order loop corrections on long CMB scales to grow rapidly, potentially pushing the model out of perturbative control.
This paper derives all-order interaction Hamiltonians and non-linear field relations for single-field inflation with a transient ultra-slow-roll phase, demonstrating that loop corrections to long-wavelength perturbations grow rapidly as , thereby causing a breakdown of perturbative control at the fourth loop order in standard models used for primordial black hole formation.