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arXiv 0908.4099hep-ph
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有限温度和密度下的约束模型

Confinement Models at Finite Temperature and Density

Pok Man Lo, Eric S. Swanson

摘要:

研究了QCD禁闭势模型中的介质内手征对称性破缺。过去分析这些模型的尝试受到非零温度下出现的红外发散的阻碍。我们认为,以前试图绕过这个问题是不令人满意的,并展示了一个简单的解决方案。我们还表明,限制模型不表现出手征相变的期望是不正确的。求和环图的效果进行了研究,我们提出了第一次确定的温度-密度相图两个模型系统。我们发现,观测量和相结构的禁闭模型强烈依赖于夸克极化是否占。最后,标准禁闭模型似乎不能充分描述强子现象和QCD的介质性质。

英文摘要:

In-medium chiral symmetry breaking in confining potential models of QCD is examined. Past attempts to analyse these models have been hampered by infrared divergences that appear at non-zero temperature. We argue that previous attempts to circumvent this problem are not satisfactory and demonstrate a simple resolution. We also show that the expectation that confining models do not exhibit a chiral phase transition is incorrect. The effect of summing ring diagrams is investigated and we present the first determination of the temperature-density phase diagram for two model systems. We find that observables and the phase structure of the confinement models depend strongly on whether quark polarisation is accounted for. Finally, it appears that standard confinement models cannot adequately describe both hadron phenomenology and in-medium properties of 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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