Compact star of holographic nuclear matter and GW170817

被引：14
作者：
Zhang, Kilar [1 ]
Hirayama, Takayuki [2 ]
Luo, Ling-Wei [3 ]
Lin, Feng-Li [1 ]
机构：
[1] Natl Taiwan Normal Univ, Dept Phys, Taipei 11677, Taiwan
[2] Chubu Univ, Coll Engn, 1200 Matsumoto, Kasugai, Aichi 4878501, Japan
[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
来源：
PHYSICS LETTERS B | 2020年 / 801卷
关键词：
NEUTRON-STARS;
D O I：
10.1016/j.physletb.2019.135176
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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: epsilon = 2.629A(-0.192)p(1.192) + 0.131A(0.544)p(0.456) with A a tunable parameter of order 10(-1), where epsilon and pare 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 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. (C) 2019 The Authors. Published by Elsevier B.V.
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页数：6
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