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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >The phase diagram of the quark-meson model
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The phase diagram of the quark-meson model

机译：夸克介子模型的相图

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Within the proper-time renormalization group approach, the chiral phase diagram of a two-flavor quark-meson model is studied. In the chiral limit, the location of the tricritical point which is linked to a Gaussian fixed point, is determined. For quark chemical potentials smaller than the tricritical one the second-order phase transition belongs to the O (4) universality class. For temperatures below the tricritical one we find initially a weak first-order phase transition which is commonly seen in model studies and also in recent lattice simulations. In addition, below temperatures of T less than or similar to 17 MeV we find two phase transitions. The chiral restoration transition is initially also of first-order but turns into a second-order transition again. This leads to the possibility that there may be a "second tricritical" point in the QCD phase diagram in the chiral limit. (c) 2005 Elsevier B.V. All rights reserved.
机译：在适当时间重归一化组方法中，研究了两味夸克介子模型的手性相图。在手性极限中，确定了与高斯固定点链接的三临界点的位置。对于夸克化学势小于三临界化学势的二阶相变，属于O（4）普遍性类别。对于低于三临界温度的温度，我们最初会发现一阶微弱的相变，这在模型研究和最近的晶格模拟中很常见。此外，在低于或低于17 MeV的T温度下，我们发现了两个相变。手性恢复过渡最初也是一阶的，但再次变为二阶过渡。这导致在手性极限中QCD相图中可能存在“第二三临界”点的可能性。 （c）2005 Elsevier B.V.保留所有权利。

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