摘要
在MIT口袋模型的基础上采用密度依赖口袋常数,给出了奇异夸克物质的热力学关系,并用于描述奇异夸克物质及混合星内的夸克相,研究了奇异星、混合星的性质.结果表明,密度依赖口袋常数下,奇异夸克物质的压强公式中有一个附加项,而能量密度中则没有,从而保证了系统的热力学自洽性.在新的热力学关系下,奇异夸克物质的状态方程变软,相应的奇异星的引力质量和对应的半径均变小;混合星的状态方程也变软,其质量变小,而对应的半径也变小.说明经热力学自洽处理后该模型对中子星的状态方程及相应的质量-半径关系等都有显著的影响.
Thermodynamics of strange quark matter with density-dependent bag parameter is given by making use of MIT bag model, and properties of strange and hybrid stars are investicated by using them. Our results indicate that an extra term should be appended to the pressure expression of strange quark matter but not to the energy density when the bag constant is density-dependent, which assures self-consistency of the system. With this extra term, strange quark matter equations of state soften, gravitational mass and corresponding radius of strange star decrease compared with the inconsistent case. The hybrid star equations of state soften and corresponding mass and radius for hybrid star decrease when this model is used to describe quark phase in hybrid star. These indicate that new thermodynamics for strange quark matter with density-dependent bag parameter has an important influence on properties of stmge star and hybrid star.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第1期104-108,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10275029
11265009)
河南省教育厅自然科学研究计划项目(批准号:2008A140009)
内蒙古民族大学博士科研启动基金(批准号:NMDBS275)资助的课题~~
关键词
密度依赖口袋常数
混合星
状态方程
质量-半径关系
density-dependent bag constant, hybrid star, equations of state, mass-radius relations
