流夸克质量对奇异星性质的影响

Influence of the Choice of the Current Quark Mass on the Properties of Strange Stars

本文用有效质量口袋模型描述夸克物质研究了流夸克质量的选取对奇异星性质的影响.结果表明,随着流夸克质量的增大,奇异夸克物质的状态方程变软,奇异星的最大质量及对应的半径变小.奇异流夸克质量由90 MeV增到200 MeV时,奇异星最大质量由1.38 M⊙减小至1.32 M⊙,相应的半径由8.0 km变到7.64 km.可知,流夸克质量的选取对奇异星的性质有一定的影响.

In this paper the influence of choice of the current quark mass on the properties of strange stars is studied by using the effective mass bag model to describe quark matter. The numerical analysis shows that with the increase of the current quark mass , the increasement of the number density of down quark and decreasement of the number density of strange quark become bigger at low total baryon number density; the equation of state of the strange quark matter softens, the maximum mass and the corresponding radius deccrease. The maximum mass of the star decreases from 1.38 M⊙ to 1.32 M⊙ and the corresponding radius of the star ranges from 8.0 km to 7.64 km with the increase of the current mass of the strange quark from 90 MeV to 200 MeV.