3826 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 investigates the dynamics of charged particles around magnetized Schwarzschild black holes to classify orbital configurations and applies the resulting model, validated via Markov Chain Monte Carlo fitting to S2 star data, to interpret the motion of the S2 star and hotspots near Sagittarius A*.
This paper demonstrates that in a BRST-invariant quantization of General Relativity, the bulk Hamiltonian can be expressed as a BRST-exact operator (the anticommutator of the BRST charge and the temporal ghost field), which governs time-reparameterization of physical observables without trivializing the time evolution of gravitational backgrounds or scattering amplitudes.
This paper presents the optical design and sensitivity modeling of CHRONOS, a cryogenic, triangular Sagnac speed-meter interferometer that achieves a quantum-noise-limited strain sensitivity of approximately at 1 Hz, enabling laboratory-scale detection of intermediate-mass black holes, stochastic gravitational wave backgrounds, and gravity-gradient signals.
This paper presents and validates a novel search pipeline utilizing an improved Viterbi algorithm and enhanced time-frequency analysis to effectively detect and characterize gravitational waves from planetary-mass primordial black hole binaries in LIGO O3 data, achieving high recovery rates and accurate chirp mass estimation across Galactic scales.
The GUEST mission proposes a 30-year passive satellite laser-ranging concept using two dense spheres in highly eccentric Earth orbits to detect microhertz gravitational waves and simultaneously advance research in fundamental physics, cosmology, and geodesy.
This paper demonstrates that the Einstein Telescope could detect cosmic strings through gravitational wave lensing by applying wave optics to analyze amplification and waveform effects, ultimately using Bayesian inference on simulated merger data to estimate string tensions consistent with injected values.
This paper maps the detectability of cosmological stasis scenarios in the inflationary gravitational wave background across current and future observatories, demonstrating that the BBO mission can probe the entire parameter space for suppressed spectra while also characterizing Standard Model-induced spectral steps and validating the testability of consistency relations despite finite-width transition effects.
This study uses Markov chain Monte Carlo analyses of multiple cosmological datasets to constrain a class of modified cosmologies derived from a generalized mass-to-horizon relation, finding that while these models can partially alleviate the Hubble tension by adjusting the Hubble constant, they are statistically disfavored compared to the standard CDM model and fail to fully resolve the discrepancy.
This paper investigates the dynamics of periodic orbits and their associated gravitational wave signatures in the spacetime of a Bonanno–Reuter regular black hole, demonstrating that Asymptotically Safe Gravity corrections systematically contract orbital radii and induce distinct, topology-dependent phase shifts in waveforms that are potentially detectable by future space-based observatories like LISA.
This paper establishes a quasilocal Carrollian framework for gravitational memory at finite distances using null hypersurfaces, demonstrating through Robinson--Trautman spacetimes that the standard Bondi displacement memory emerges as the universal asymptotic limit of a broader geometric response that retains near-zone information and exhibits non-monotonic energy fluxes in the presence of a cosmological constant.