3784 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 constrains two gravity models using a comprehensive dataset including DESI DR2 and strong-lensing time delays, finding that the square-root exponential model outperforms the standard CDM model in explaining the Universe's late-time accelerated expansion without a cosmological constant.
This paper proposes that generalized infinite- limits of boundary CFTs, defined via free ultrafilters as "ultralimits," yield a family of theories () whose ensemble average in the gravitational path integral accounts for baby universes and spacetime wormholes, particularly in the context of Antonini-Sasieta-Swingle-like states.
This paper computes high-frequency gravitational wave radiation from collisions between light and heavy compact objects using shockwave propagators, revealing a perturbative expansion of tidal response functions that connect Lipatov vertex amplitudes to Weinberg's soft radiation limits while highlighting double-copy structures with Yang-Mills gluon radiation.
This paper demonstrates that a spatially flat FLRW universe with non-extensive Loop Quantum Gravity entropy on its apparent horizon exhibits a thermodynamic critical point belonging to the mean-field universality class, characterized by specific critical exponents and diverging response functions, which only emerges for non-extensive parameters and corresponds to an entropy deformation of order unity.
This paper investigates spherical accretion onto static Konoplya-Zhidenko black holes by deriving the fluid motion Hamiltonian and analyzing how spacetime deformation influences critical points and flow trajectories across various fluid equations of state, ultimately comparing these effects with those of other modified black hole geometries.
This paper presents the first explicit construction of large-scale, gauge-invariant phase-space variables and the corresponding quadratic and cubic Hamiltonians for multifield inflation at second-order perturbation theory, demonstrating their consistency with standard gauge-fixed results and providing a framework for extending these calculations to higher orders.
This paper demonstrates that the standard quantum statistical relation for black hole thermodynamics fails for charged magnetic black holes in five-dimensional Einstein-Maxwell-Chern-Simons theory unless the Euclidean action is completed with a nonlocal radial integral to form a strictly gauge-invariant transgression form, which is necessary to restore thermodynamic consistency and the first law.
This paper demonstrates that using the scheme of Loop Quantum Gravity within metric variables allows for an effective description of Oppenheimer-Snyder gravitational collapse in both flat and spherical models where a negative pressure term prevents singularity formation and facilitates a transition from a black hole to a white hole state at the Planck scale.
This paper presents a comprehensive analysis combining multiple CMB probes, DESI DR2 BAO, and supernova data, which reveals a significant preference for interacting dark energy models with an interaction term proportional to dark energy density () over the standard CDM model, particularly when using SPT+DESI+DESY5 data that shows a deviation from zero interaction.
Based on -body simulations showing that orbital velocity increases linearly over time, this paper conjectures a crude upper mass limit of approximately for supermassive black holes in the current universe, beyond which equal-mass binaries would fail to coalesce within the age of the universe.