4428 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 that the observed red spectral tilt in inflation can be explained without an inflaton field by attributing the necessary slow drift in the Hubble rate to the quantum break-time of de Sitter space, which generates a distinctive positive running of the spectral index and falsifiable predictions for the tensor spectral tilt.
This paper presents the first sub-solar mass binary search using data from both O4a and O4b of LIGO's fourth observing run, finding no significant candidates and establishing improved upper limits on merger rates and local dark matter fractions compared to previous searches.
This paper proposes that a nearly constant ratio of approximately 2.3 between the peak frequencies of gravitational waves from binary black hole mergers and those from evaporating black holes serves as a robust signature of new black hole physics, potentially allowing for the direct inference of specific properties like the Hayward model's hair parameter.
This paper develops a post-Newtonian framework for binary systems interacting via a scalar field in odd-dimensional de Sitter and anti-de Sitter spacetimes, deriving equations of motion up to 2PN order and demonstrating that the background's conformal algebra manifests as a curvature-dependent deformation of the Poincaré algebra in phase space.
This paper presents the first analytic computation of time-domain gravitational waveform multipoles for hyperbolic black-hole scattering at leading post-Minkowskian order to all orders in velocity, utilizing cut loop integrals and dimensional regularization to derive logarithmic expressions that facilitate the integration of post-Minkowskian fluxes into binary merger waveform models.
This paper proposes a phenomenological model where supermassive black holes grow via simultaneous baryonic accretion and scalar cloud decay, revealing that while boson masses around to eV maximize early growth efficiency, observational constraints from quasar data favor lower masses near to eV, suggesting distinct bosonic scales may play complementary roles in black hole formation and dark matter phenomenology.
This paper presents a systematic method to derive analytical time-domain gravitational waveforms for hyperbolic black-hole scattering at first order in the self-force expansion and all orders in the post-Newtonian/post-Minkowskian expansion by introducing a dimensional-regularization-inspired prescription to resolve divergences and expressing the solution through Lauricella functions.
This paper reports a gravitational wave search for compact binary coalescences with sub-solar mass components using data from the second part of LIGO-Virgo-KAGRA's fourth observing run, finding no significant detections but establishing stringent upper limits on merger rates that constrain dark matter scenarios involving primordial and dissipative-model black holes.
This paper develops a harmonic framework for spherically symmetric Friedmann-like cosmologies with constant scalar curvature and non-zero trace-free Ricci curvature, demonstrating how tidal fields induce spectral mixing between radial eigenmodes while preserving angular labels, thereby extending perturbation theory beyond maximally symmetric models.
This paper demonstrates that relativistic acceleration and detector non-identicality can actively control the strength and directionality of harvested quantum steering from the Minkowski vacuum, revealing that the Unruh effect can reshape steering asymmetry and even activate one-way steering rather than merely degrading quantum correlations.