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Merger and Post-merger of Binary Neutron Stars with a Quark-hadron Crossover Equation of State by Huang, Yong-Jia; Baiotti, Luca; Kojo, Toru; Takami, Kentaro; Sotani, Hajime; Togashi, Hajime; Hatsuda, Tetsuo; Nagataki, Shigehiro; Fan, Yi-Zhong is a scholarly article available to read on EtoBox.

What is Merger and Post-merger of Binary Neutron Stars with a Quark-hadron Crossover Equation of State about?

Fully general-relativistic binary-neutron-star (BNS) merger simulations with quark-hadron crossover (QHC) equations of state (EOSs) are studied for the first time. In contrast to EOSs with purely hadronic matter or with a first-order quark-hadron phase transition (1PT), in the transition region QHC EOSs show a peak in sound speed, and thus a stiffening. We study the effects of such stiffening in the merger and post-merger gravitational (GW) signals. Through simulations in the binary-mass range $2.5 < M/M_{\odot} < 2.75$, characteristic differences due to different EOSs appear in the frequency of the main peak of the post-merger GW spectrum ($f_2$), extracted through Bayesian inference. In particular, we found that (i) for lower-mass binaries, since the maximum baryon number density ($n_{\rm max}$) after the merger stays below $3\text{--}4$ times the nuclear-matter density ($n_0$), the characteristic stiffening of the QHC models in that density range results in a lower $f_2$ than that computed for the underlying hadronic EOS and thus also than that for EOSs with a 1PT, (ii) for higher-mass binaries, where $n_{\rm max}$ may exceed $4\text{--}5 n_0$ depending on the EOS model, whether

Author

Huang, Yong-Jia; Baiotti, Luca; Kojo, Toru; Takami, Kentaro; Sotani, Hajime; Togashi, Hajime; Hatsuda, Tetsuo; Nagataki, Shigehiro; Fan, Yi-Zhong

Published

2022

Language

EN