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arXiv 0712.2886hep-ph
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2,3和(2+1)味QGP的自洽准粒子模型

Self-consistent quasiparticle model for 2, 3 and (2+1) flavor QGP

Vishnu M. Bannur

摘要:

夸克-胶子等离子体的准粒子模型是描述介质本身热力学性质的粒子的统计力学,它与等离子体频率有关,质量依赖于介质。在相对论极限下,等离子体频率取决于数密度和温度。数密度是介质的热力学量,其又取决于等离子体频率。因此,需要自洽地解决这个问题,而不是使用等离子体频率的微扰表达式。在这里,我们进行这样一个自洽的计算使用我们,最近开发的,一个新的配方准粒子模型。通过调整每个系统的一个参数,对2、3和(2+1)味夸克-胶子等离子体系统,首先在化学势为零的情况下,得到了与格点量子色动力学非常好的拟合。然后,将其推广到有限化学势体系,在不增加任何新参数的情况下,与格点结果吻合得很好。

英文摘要:

Quasi-particle model of quark gluon plasma is the statistical mechanics of particles with medium dependent mass, related to plasma frequency, which was proposed to describe the thermodynamics of the medium itself. At relativistic limit the plasma frequency depends on number density and temperature. The number density is a thermodynamic quantity of the medium which in turn depends on plasma frequency. Hence, one need to solve this problem self-consistently, instead of using perturbative expressions for plasma frequency. Here we carry out such a self-consistent calculations using our, recently developed, a new formulations of quasiparticle model. By adjusting a single parameter for each system, a remarkably good fit to lattice QCD results are obtained for 2, 3 and (2+1) flavor quark gluon plasma systems, first, with zero chemical potential. Then, it is extended to systems with finite chemical potential and fits very well the lattice results without any new parameter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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