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arXiv 1206.0509astro-ph.HEgr-qc
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双中子星合并中的引力波、中微子发射和超子效应

Gravitational waves, neutrino emissions, and effects of hyperons in binary neutron star mergers

Kenta Kiuchi, Yuichiro Sekiguchi, Koutarou Kyutoku, Masaru Shibata

摘要:

在完全广义相对论中,结合核子和超音速有限温度状态方程(EOS)和中微子冷却,对双星中子星合并进行了数值模拟。结果表明,对于核子态和超子态方程,对于总质量为$\approx 2.7 M_\odot$的情况,最终的结果是长寿命的超质量中子星(HMNS)$(t_{\rm life}\gtrsim 10 {\rm ms})$.对于总质量$\approx 3 M_\odot$,长寿命(与$t_{\rm life}\approx 3 {\rm ms}$一起短寿命)HMNS是核子(超声波)EOS的结果。结果表明,HMNS的典型总中微子光度为$\sim 3$ -- $6 \times 10^{53} {\rm erg /s}$,当源距为100 Mpc时,HMNS引力波的有效振幅为1 -- $4\times 10^{-22}$ at $f\approx 2$ -- $3.2 {\rm kHz}$.在HMNS阶段,引力波的特征频率转移到一个更高的频率为超子EOS相比,在核子EOS中,他们保持不变。我们的发现表明超子效应在引力波中有很好的印记,它的探测将为我们探索中子星物质的组成提供一个潜在的机会。同时给出了黑洞形成时的中微子光度曲线。

英文摘要:

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. It is found that for the nucleonic and hyperonic EOS, a hyper massive neutron star (HMNS) with a long lifetime $(t_{\rm life}\gtrsim 10 {\rm ms})$ is the outcome for the total mass $\approx 2.7 M_\odot$. For the total mass $\approx 3 M_\odot$, a long-lived (short-lived with $t_{\rm life}\approx 3 {\rm ms}$) HMNS is the outcome for the nucleonic (hyperonic) EOS. It is shown that the typical total neutrino luminosity of the HMNS is $\sim 3$ -- $6 \times 10^{53} {\rm erg /s}$ and the effective amplitude of gravitational waves from the HMNS is 1 -- $4\times 10^{-22}$ at $f\approx 2$ -- $3.2 {\rm kHz}$ for a source of distance of 100 Mpc. During the HMNS phase, characteristic frequencies of gravitational waves shift to a higher frequency for the hyperonic EOS in contrast to the nucleonic EOS in which they remain constant approximately. Our finding suggests that the effects of hyperons are well imprinted in gravitational wave and its detection will give us a potential opportunity to explore the composition of the neutron star matter. We present the neutrino luminosity curve when a black hole is formed as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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