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arXiv 1902.08477hep-phastro-ph.HEgr-qchep-th
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全息核物质致密星与GW170817

Compact Star of Holographic Nuclear Matter and GW170817

Kilar Zhang, Takayuki Hirayama, Ling-Wei Luo, Feng-Li Lin

摘要:

本文利用量子色动力学的全息模型导出了中等重子密度冷核物质的物态方程。这个模型是在取消限制的Witten几何中Sakai-Sugimoto模型的基础上,增加了一个点状D4膜瞬子组态作为全息重子。我们的EoS采用以下双多方形式:$ ε=2.629 {\cal A}^{-0.192} p^{1.192}+0.131 {\cal A}^{0.544} p^{0.456}$,其中$\cal A$是$10^{-1}$阶的可调参数,其中$ε$和$p$分别是能量密度和压力。声速满足因果关系约束,突破了音障。我们求解了紧致星的Tolman-Oppenheimer-Escheroff方程,得到了适当选取$\cal A$时的紧致性.在此基础上,进一步计算了单星和双星的潮汐形变。我们发现我们的结果与LIGO/Virgo数据分析对GW170817的推断值一致。

英文摘要:

We use a holographic model of quantum chromodynamics to extract the equation of state (EoS) for the cold nuclear matter of moderate baryon density. This model is based on the Sakai-Sugimoto model in the deconfined Witten's geometry with the additional point-like D4-brane instanton configuration as the holographic baryons. Our EoS takes the following doubly-polytropic form: $ ε=2.629 {\cal A}^{-0.192} p^{1.192}+0.131 {\cal A}^{0.544} p^{0.456}$ with $\cal A$ a tunable parameter of order $10^{-1}$, where $ε$ and $p$ are the energy density and pressure, respectively. The sound speed satisfies the causality constraint and breaks the sound barrier. We solve the Tolman-Oppenheimer-Volkoff equations for the compact stars and obtain the reasonable compactness for the proper choices of $\cal A$. Based on these configurations we further calculate the tidal deformability of the single and binary stars. We find our results agree with the inferred values of LIGO/Virgo data analysis for GW170817.

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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