混合星物质的状态方程和奇异夸克物质的稳定窗  

Equation of State in Hybrid Stars and the Stability Window of Quark Matter

作　　者：李昕[1] 温新建[1] 

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《山西大同大学学报（自然科学版）》2014年第2期23-29,共7页Journal of Shanxi Datong University(Natural Science Edition)

摘　　要：本文研究包含核物质-奇异夸克物质混合相的混合星的性质。利用准粒子模型中自洽热力学处理方案来研究奇异夸克相。根据稳定性要求,在袋常数-相互作用耦合常数平面内呈现奇异夸克物质的稳定窗。我们发现亚稳定态(或者不稳定态)纯夸克物质参数会导致夸克-强子混合相的存在。混合星的质量-半径关系主要由夸克物质的状态方程来决定的。与中子星相比,由于混合相的存在,当混合星的半径为10.6千米时它的质量为1.64倍太阳质量。We study the equation of state of the condense matter and calculate the mass-radius relation of hybrid stars with a mixed phase composed of the hadronic matter and strange quark matter are studied. Due to the new freedom of strange flavor,strange quark matter might be more stable than nuclear matters and other two-flavor quark matter, and therefore could be the true ground state of the hadron matter. We use the relativistic mean-field theory to study the equation of state of nuclear matter. The quark phase is investigated by the quark quasiparticle model with a self-consistent thermodynamic and statistical. We present the stability window of the strange quark matter with respect to the interaction coupling constant versus the bag constant. By comparing with the classical of nuclear physics, we can determine the stability area of quark matters. At the high density, the hadron matter will be converted into the strange quark matter through a deconfined phase transition. We find that the appearance of the quarkhadron mixed phases is associated with the meta-stable or unstable regions of the pure quark matter parameters. The mass-radius relation of the hybrid star is dominated by the equation of state of quark matter rather than nuclear matter. Due to the existence of the mixed phase, the maximum mass of hybrid star is 1.64 MO with radius about 10.6km.

关 键 词：准粒子模型 夸克物质的状态方程 混合星 

分 类 号：O175.13[理学—数学]