Coexistence of color superconductivity and chiral symmetry breaking within the NJL model
Coexistence of color superconductivity and chiral symmetry breaking within the NJL model
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DOI：
10.1140/epja/i2003-10003-9
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
D. Blaschke;M. Volkov;V. Yudichev
中科院分区：
文献类型：
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作者：
D. Blaschke;M. Volkov;V. Yudichev
在一个简单的Nambu-Jona-Lasinio模型中研究了夸克物质的相图。结果发现，在温度-密度平面的相结构敏感地依赖于模型的参数化。我们提出了两种模型的参数化方案，其中，在第一种方案中，在Tt = 55 MeV的三相点以下发生从手征对称性破缺的相到彩色超导相的一级相变，而对于第二种方案，在Tt = 7 MeV以下发现了二级相变。此外，还存在一个手征对称性破缺与色超导共存相，这是这类模型中的一个新发现。在重子密度高的QCD相变的现象可能的后果进行了讨论。
The phase diagram for quark matter is investigated within a simple Nambu-Jona-Lasinio model without vector correlations. It is found that the phase structure in the temperature-density plane depends sensitively on the parametrization of the model. We present two schemes of parametrization of the model where, within the first one, a first-order phase transition from a phase with broken chiral symmetry to a color superconducting phase for temperatures below the triple point atTt= 55 MeV occurs, whereas for the second one a second-order phase transition for temperatures belowTt= 7 MeV is found. In the latter case, there is also a coexistence phase of broken chiral symmetry with color superconductivity, which is a new finding within this class of models. Possible consequences for the phenomenology of the QCD phase transition at high baryon densities are discussed.