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arXiv 0902.1498hep-phcond-mat.str-elnucl-th
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有限密度和温度下的非微扰Yukawa理论

Nonperturbative Yukawa theory at finite density and temperature

Eduardo S. Fraga, Leticia F. Palhares, Marcus Benghi Pinto

摘要:

汤川介质理论是粒子物理标准模型热力学的一部分,也是大多数费米子系统有效场论的主要组成部分之一。通过计算其压强,我们研究了有限温度和密度下的非微扰热力学优化微扰理论(OPT)框架。我们的计算适用于任意的费米子和标量质量,温度,化学势,而不限于弱耦合。该模型被认为是在冷凝物的存在下,以及在没有。与非微扰结果的比较表明,二阶微扰理论(PT)失败,在第一种情况下,但执行相当不错时,冷凝物是不存在的,即使在高温制度。

英文摘要:

In-medium Yukawa theory is part of the thermodynamics of the Standard Model of particle physics and is one of the main building blocks of most effective field theories of fermionic systems. By computing its pressure we investigate the nonperturbative thermodynamics at finite temperature and density using the optimized perturbation theory (OPT) framework. Our calculations are valid for arbitrary fermion and scalar masses, temperature, chemical potential, and not restricted to weak coupling. The model is considered in the presence as well as in the absence of condensates. Comparison with nonperturbative results shows that second order perturbation theory (PT) fails in the first case but performs rather well when condensates are absent, even at high-temperature regimes.

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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