2020-03-13 11:00  P7F

GW170817 and GW190425 as hybrid stars of dark and nuclear matters

Hong Zhang

We propose three scenarios for hybrid compact stars consisting of nuclear and dark matters to intepret the LIGO/Virgo events GW170817 and GW190425. The equation of state for the nuclear matter is extracted from holographic quantum chromodynamics, and the one for the dark matter is extracted from the massive boson with quartic self-coupling. We study the mass-radius and tidal Love number-mass relations for these hybrid compact stars, and find that they can well explain GW170817 and GW190425. Some of the hybrid stars can have compact neutron or mixed cores around 10km while possessing a thick dark matter shell, which can then explain the astrophysical observations of neutron stars with compact photon radius and mass higher than 2 solar masses. Reversely, we also infer the dark matter model from the parameter estimation of GW190425. Our scenarios of compact hybrid stars can be further tested by the coming LIGO/Virgo O3 events.