密度依赖口袋参数下奇异夸克物质的热力学关系及奇异星

Thermodynamics of Strange Quark Matter with Density-dependent Bag Constant and Strange Stars

在美国麻省理工学院(MIT)口袋模型的基础上采用密度依赖口袋参数,给出了奇异夸克物质正确的热力学关系,并研究了奇异物质及奇异星的性质.结果表明,密度依赖口袋常数下,奇异夸克物质的压强有一个附加项,而能量密度中则没有这样的附加项,从而保证了系统的热力学自洽性.热力学自洽情形下奇异夸克物质的状态方程比原来变软,相应的奇异星的引力质量和对应的半径均变小,说明密度依赖口袋常数下的新热力学关系对奇异物质及奇异星的性质有重要影响.

Thermodynamics of strange quark matter are given by making use of MIT bag model with density-dependent bag parameter.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.At the same time,gravitational mass and corresponding radius of strange star decrease compared with the inconsistent case.