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arXiv 1312.0102hep-lat
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多味QCD中有限温度和密度相变的性质

Nature of finite temperature and density phase transitions in many-flavor QCD

Shinji Ejiri, Norikazu Yamada

摘要:

我们研究了(2+Nf)味QCD的相结构,其中存在两种轻味和Nf质量味,以讨论在现实的人工色方案中电弱重子生成的可行性,并理解有限密度QCD的性质.由于有限温度下一级相变的出现是重子生成的必要条件,因此研究有限温度下相变的性质具有重要意义。应用重加权方法,计算了多味QCD中元格的概率分布函数。通过分布函数的形状,我们确定了重口味终止于一级区域的临界质量,并发现它随着Nf而变大。我们还研究了有限密度下的临界线,发现随着化学势的增加,一级区域变宽。我们讨论了如何从多味QCD的模拟中提取有限温度和密度下的实(2+1)味QCD的性质。

英文摘要:

We investigate the phase structure of (2+Nf)-flavor QCD, where two light flavors and Nf massive flavors exist, to discuss the feasibility of the electroweak baryogenesis in realistic technicolor scenario and to understand properties of finite density QCD. Because an appearance of a first order phase transition at finite temperature is a necessary condition for the baryogenesis, it is important to study the nature of finite temperature phase transition. Applying the reweighting method, the probability distribution function of the plaquette is calculated in the many-flavor QCD. Through the shape of the distribution function, we determine the critical mass of heavy flavors terminating the first order region, and find it to become larger with Nf. We moreover study the critical line at finite density and the first order region is found to become wider as increasing the chemical potential. We discuss how the properties of real (2+1)-flavor QCD at finite temperature and density can be extracted from simulations of many-flavor QCD.

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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