Properties of quark matter in a new quasiparticle model with QCD running coupling  

作　　者：Zhen Yan Lu Guang Xiong Peng Jian Feng Xu Shi Peng Zhang 

机构地区：[1]School of Physical Sciences, University of Chinese Academy of Sciences [2]Theoretical Physics Center for Science Facilities, Institute of High Energy Physics

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第6期49-57,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11135011,11475110 and 11575190)

摘　　要：The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective bag constant. The chemical potential dependence of the renormalization subtraction point is constrained by the Cauchy condition in the chemical potential space. The stability and microscopic properties of strange quark matter are then studied within the completely self-consistent quasiparticle model, and the obtained equation of state of quark matter is applied to the investigation of strange stars. It is found that our improved model can describe well compact stars with mass about two times the solar mass, which indicates that such massive compact stars could be strange stars.The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective bag constant. The chemical potential dependence of the renormalization subtraction point is constrained by the Cauchy condition in the chemical potential space. The stability and microscopic properties of strange quark matter are then studied within the completely self-consistent quasiparticle model, and the obtained equation of state of quark matter is applied to the investigation of strange stars. It is found that our improved model can describe well compact stars with mass about two times the solar mass, which indicates that such massive compact stars could be strange stars.

关 键 词：quark matter quasiparticle model thermodynamic inconsistency 

分 类 号：O572.243[理学—粒子物理与原子核物理]