Hyperon bulk viscosity effects in neutron-star inspirals

Abstract

The paper revisits the role of hyperon bulk viscosity during neutron-star inspiral. We find that hyperon bulk viscosity exerts only a minor influence on the gravitational-wave phase, causing a phase shift of $\sim 10^{-3}\mathrm{rad}$. This shift is too small to be detected by existing gravitational-wave observatories, and it seems unlikely that next-generation detectors will be able to isolate this effect from other factors. However, our analysis indicates that hyperon bulk viscosity can significantly heat the hyperon core of a neutron star, raising its temperature to approximately $5\times 10^8\mathrm{K}$.

Comments: 13 pages, 5 figures, accepted for publication in Phys.Rev.D