http://arxiv.org/abs/2204.00090
The amplitude propagation of gravitational waves in an Einstein-Cartan-Sciamma-Kibble (ECSK) theory is studied by assuming a dark matter spin tensor sourcing for spacetime torsion at cosmological scales. The analysis focuses on a weak-torsion regime, such that gravitational wave emission, at leading and subleading orders, does not deviate from standard General Relativity. We show that, in principle, the background torsion induced by an eventual dark matter spin component could lead to an anomalous dampening or amplification of the gravitational wave amplitude, after going across a long cosmological distance. The importance of this torsion-induced anomalous propagation of amplitude for binary black hole mergers is assessed. For realistic late-universe astrophysical scenarios, the effect is tiny and falls below detection thresholds, even for near-future interferometers such as LISA. To detect this effect may not be impossible, but it is still beyond our technological capabilities.
E. Elizalde, F. Izaurieta, C. Riveros, et. al.
Mon, 4 Apr 22
26/50
Comments: 29 pages, 2 figures, comments welcome