Isospin properties in quark matter and quark stars within isospin-dependent quark mass models

Peng-Cheng Chu, Yi Zhou, Xin Qi, Xiao-Hua Li, Zhen Zhang, and Ying Zhou
Phys. Rev. C 99, 035802 – Published 7 March 2019

Abstract

We investigate the isospin properties of the strange quark matter (SQM) and quark stars (QSs) in the framework of the isospin-dependent confining quark matter (ICQM) model and confined-isospin and density-dependent mass (CIDDM) model. Within these two isospin-dependent quark mass phenomenological models, we study the quark matter symmetry energy, the stability of strange quark matter, the quark fractions, the isospin asymmetry, and the quark mass asymmetry in SQM, and the mass-radius relation of quark stars. We find that including isospin dependence of the quark mass can significantly influence the isospin properties of the quark matter. Recently, the LIGO-Virgo collaboration reported their detection of gravitational wave (GW) signals GW170817, which are originating from a binary compact star merger. Using the ICQM model and CIDDM model, we describe the compact stars with the new maximum mass limits 2.010.04+0.04M/M2.160.15+0.17 as quark stars, and the dimensionless tidal deformabilities of QSs are also investigated in this work.

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  • Received 28 September 2018
  • Revised 21 January 2019

DOI:https://doi.org/10.1103/PhysRevC.99.035802

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Peng-Cheng Chu1,*, Yi Zhou2, Xin Qi1, Xiao-Hua Li3,4,†, Zhen Zhang5,‡, and Ying Zhou6,§

  • 1School of Science, Qingdao University of Technology, Qingdao 266000, China
  • 2School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266000, China
  • 3School of Nuclear Science and Technology, University of South China, 421001 Hengyang, China
  • 4Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, 421001 Hengyang, China
  • 5Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
  • 6School of Physics and Astronomy and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai 200240, China

  • *kyois@126.com
  • lixiaohuaphysics@126.com
  • zhangzh275@mail.sysu.edu.cn
  • §yingchow@sjtu.edu.cn

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Issue

Vol. 99, Iss. 3 — March 2019

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