arXiv subjects

Guo-Qiang Jin

Publications and source records attributed to Guo-Qiang Jin.

2 recordsLinked to original sources

arXiv2026

Gravitational-wave propagation and standard sirens in dynamical Barbero--Immirzi gravity: an action-level analysis

We develop an action-level framework for identifying which dynamical Barbero--Immirzi sectors can modify cosmological tensor propagation in a bosonic, two-derivative, curvature-linear Einstein--Cartan class. Eliminating the algebraic Lorentz connection shows that the Holst-to-Palatini ratio contributes to the scalar kinetic metric, whereas the transverse-traceless tensor normalization is controlled by the parity-even Hilbert--Palatini coefficient. Consequently, a dynamical Holst coefficient at fixed parity-even normalization does not by itself generate anomalous gravitational-wave friction: the minimal dynamical-Holst theory lies exactly on the general-relativistic propagation surface. We then construct a leading analytic parity-invariant nonminimal realization, exhibit a regular cosmological background satisfying both Friedmann equations, and verify the invariant two-derivative kinetic conditions along that benchmark. Finally, we recast published GWTC-3 and GWTC-4.0 constraints and the two public GWTC-4.0 hyperposterior products to determine which action-level combination present standard sirens constrain. The corresponding catalog constraints remain broad and depend on the adopted priors and population assumptions; itconstrains the evolution of a nonminimal parity-even curvature sector rather than minimal Barbero--Immirzi torsion, providing an action-level interpretation of standard-siren propagation tests.

gr-qc↗

arXiv2026

Dynamical Barbero--Immirzi field coupled to quintessence: gravitational-wave propagation constraints and next-generation forecasts

We investigate the imprints of a dynamical Barbero--Immirzi (BI) field $γ(x)$ coupled to a quintessence scalar field $ϕ$ on gravitational-wave (GW) propagation. In the framework of Einstein--Cartan--Holst gravity, promoting $γ$ to a dynamical scalar introduces a stress--energy that back-reacts on the metric, modifying the GW friction term. A minimal coupling $\proptoβ\,ϕ^2γ^2$ between the BI field and quintessence leads to a two-parameter extension of the Belgacem--Maggiore parametrization, characterized by $\xBI$ (from the isolated BI field) and $\xcp$ (from the coupling). Using the LIGO--Virgo--KAGRA GWTC-3 dark-siren constraint $Ξ_0=1.2^{+0.7}_{-0.7}$, we obtain the first simultaneous constraints: $|\xBI|\lesssim0.7$ and $|\xcp|\lesssim0.13$ at 90\% credibility. We then forecast the sensitivity of next-generation detectors Einstein Telescope (ET) and Cosmic Explorer (CE), showing that a 10-year observation campaign can improve these bounds by roughly one to two orders of magnitude depending on the parameter---a factor of $\sim\!20$ for $\xBI$ and $\sim\!20$ for $\xcp$---reaching $σ(\xBI)\sim3\times10^{-2}$ and $σ(\xcp)\sim1.2\times10^{-2}$. Translated into microscopic parameters, this corresponds to $γ_{\rm dyn}\lesssim10^{-12}$ and $β\lesssim10^{-3}$, providing a powerful new observational window into the interplay between quantum-gravity phenomenology and dark energy.

gr-qc↗