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 paper presents the first calculation of gravitational-wave memory from binary black hole mergers in scalar-Gauss-Bonnet gravity, revealing that while direct scalar contributions are suppressed, indirect modifications to merger dynamics alter memory amplitudes by a few percent and significantly enhance the detectability of deviations from general relativity when memory is included in third-generation detector analyses.
This paper investigates whether higher-derivative terms in projectable Hořava gravity can stabilize its infrared instability by evolving into static, inhomogeneous solutions, but concludes that no such static endpoints exist, thereby reinforcing the necessity of time-dependent mechanisms like cosmic expansion to conceal the instability.
This paper computes the quantum radiation emitted by relativistic single-electron wavepackets, demonstrating that while radiation vanishes for electrons at rest, uniformly accelerated electrons exhibit secularly growing power with a classical interpretation, and that proposed experimental signatures of the Unruh effect in specific "blind spots" are dominated by transverse deviation correlators rather than the Unruh effect itself.
This paper derives the total even-in-velocity scattering observables at fifth post-Newtonian order using a worldline action and Feynman's prescription to establish a universal conservative Hamiltonian and resolve ambiguities in Effective One Body coefficients, while demonstrating the superiority of this approach over the prescription in preserving expected theoretical structures.
This paper introduces GP15, a deep-learning method that combines residual networks and normalizing flows to rapidly estimate binary black hole parameters from time-frequency spectrograms, demonstrating strong agreement with LIGO-Virgo-KAGRA results while generating posterior samples in seconds.
This paper applies and refines a statistical dispersion metric to establish robust thresholds for distinguishing between dynamical friction from dark matter spikes and various modified gravity theories (including extra dimensions and varying ) in future space-borne gravitational wave observations of massive black-hole binaries.
This paper investigates quasinormal modes and gravitational wave echoes in symmetric and asymmetric black bounce solutions, revealing that while symmetric horizonless configurations exhibit multiple potential barriers and distinct echoes, asymmetric models closely resemble standard Reissner-Nordström black holes without producing echoes, thereby making them difficult to distinguish observationally.
By applying the generalized second law to the apparent horizon of a homogeneous and isotropic universe with an equation of state no less than $-1$, the paper demonstrates that flat and closed universes are consistent with the dominant energy condition, whereas hyperbolic universes are not.
This paper investigates how shear viscosity in the post-inflationary universe modifies the propagation of primordial gravitational waves, demonstrating that viscosity induces additional damping and spectral running—such as a blue tilt from freeze-out in the electron-photon-baryon plasma—thereby altering the gravitational wave energy density spectrum by approximately .
This paper analyzes a nonminimally coupled curvature-matter gravity model that yields dynamical dark energy, demonstrating that its parameters can simultaneously satisfy cosmological constraints from DESI, Pantheon+, and Dark Energy Survey data while remaining consistent with lunar laser ranging limits on the equivalence principle.