2593 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 review outlines the current state of Pulsar Timing Array research following the detection of a nanoHertz gravitational wave background, detailing the physics of detection, resolving tensions in astrophysical models, exploring multi-messenger searches and new physics probes, and charting the field's future trajectory with next-generation observatories.
This paper proposes that non-singular bounce cosmologies produce a distinctive oscillatory pattern in the relic gravitational wave spectrum, caused by interference between two peaks in the effective potential during the contraction phase, offering a testable "smoking-gun" signature for future gravitational wave observatories to distinguish bounce scenarios from inflation.
This paper demonstrates that in multi-field scalar-tensor theories, the interaction between a dilaton and an axion can achieve robust screening of cosmologically light scalars through a "BBQ mechanism" that cancels exterior gradients, thereby decoupling the thin-shell localization effect from force suppression and reopening viable parameter space for strongly coupled dilatons that evade single-field no-go arguments.
This paper establishes a general existence theorem for null Force-Free Electrodynamics solutions by proving that any null geodesic congruence admits a transverse basis rotation satisfying the equipartition condition and that shear-free congruences guarantee the existence of field sheet foliations, thereby providing a coordinate-independent geometric criterion for such solutions illustrated through explicit examples in various spacetimes.
CETOmega is a unified, four-dimensional framework that reconciles general relativity and quantum mechanics by deriving gravity from a causal-informational principle, where a scalar "texon" field emerging from a discrete causal network simultaneously explains dark matter and dark energy while ensuring unitarity and consistency with cosmological observations.
This paper investigates the dynamics of massive particles and associated gravitational waveforms in Einstein-Bumblebee gravity, demonstrating that while the uncharged black hole's effective potential mimics the Schwarzschild case, the distinct structure of periodic orbits and their unique phase-shifting gravitational wave signatures offer a viable method to detect Lorentz symmetry breaking via future space-based observatories.
This paper investigates anisotropic Bianchi type I cosmologies within nonlocal RT gravity and reveals that, contrary to the cosmic no-hair theorem and most other models, the theory predicts a growth of cosmic anisotropy rather than its decay.
This paper constructs a two-dimensional holographic model on the celestial sphere that successfully reproduces key infrared phenomena of four-dimensional Abelian gauge and gravitational theories, including superrotation/supertranslation matching conditions, soft theorems, and the resolution of infrared divergences through the use of Faddeev-Kulish dressed states.
This paper refutes recent claims that the 1+3 covariant approach predicts anomalously strong growth of galaxy peculiar velocities by demonstrating that a consistent application of the covariant equations yields results identical to standard metric-based perturbation theory, thereby confirming that the standard treatment is fully relativistic and does not produce unphysical bulk flows or mimic accelerated expansion.
This paper demonstrates that in quadratic gravity on a BTZ black hole background, localized Maxwell-Higgs vortices excite a stable, finite-energy scalaron mode with a universal asymptotic decay profile, thereby activating the unique local gravitational degree of freedom in three dimensions while ensuring a smooth recovery of the Einstein limit.