Numerical simulations for the merger of binary neutron stars are performed in full general relativity incorporating both nucleonic and hyperonic finite-temperature equations of state (EOS) and neutrino cooling for the first time. It is found that even for the hyperonic EOS, a hypermassive neutron star is first formed after the merger for the typical total mass ≈ 2.7M\bigodot, and subsequently collapses to a black hole (BH). It is shown that hyperons play a substantial role in the post-merger dynamics, torus formation around the BH, and emission of gravitational waves (GWs). In particular, the existence of hyperons is imprinted in GWs. Therefore, GW observations will provide a potential opportunity to explore the composition of the neutron star matter.
@article{arxiv.1110.4442,
title = {Effects of hyperons in binary neutron star mergers},
author = {Yuichiro Sekiguchi and Kenta Kiuchi and Koutarou Kyutoku and Masaru Shibata},
journal= {arXiv preprint arXiv:1110.4442},
year = {2015}
}
Comments
5 pages, 5 figures, accepted for publication in PRL