Compact star of holographic nuclear matter and GW170817

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

Research output: Contribution to journalArticle

Abstract

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=2.629A−0.192p1.192+0.131A0.544p0.456 with 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 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.

Original languageEnglish
Article number135176
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume801
DOIs
Publication statusPublished - 2020 Feb 10

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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