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arXiv 0704.2654hep-ph
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致密QCD中的相结构、集体模和轴向异常

Phase structure, collective modes, and the axial anomaly in dense QCD

Naoki Yamamoto, Motoi Tachibana, Tetsuo Hatsuda, Gordon Baym

摘要:

利用广义Ginzburg-Landau有效拉格朗日量,我们研究了具有手征和双夸克凝聚的稠密QCD在两种和三种无质量味下的拓扑结构和低集体模。正如我们之前发现的,QCD轴向异常作为一个外部场施加到色超导体中的手征凝聚体,并作为一个新的临界点出现,导致破缺的手征对称性和色超导相之间的交叉。在中等密度的手征和双夸克凝聚存在,我们推导出广义Gell-Mann- Oakes-Renner的赝标玻色子的质量和手征和双夸克凝聚的大小之间的关系。我们明确表明,在低密度的普通π介子的连续性,在高密度的广义π介子。

英文摘要:

Using a general Ginzburg-Landau effective Lagrangian, we study the topological structure and low-lying collective modes of dense QCD having both chiral and diquark condensates, for two and three massless flavors. As we found earlier, the QCD axial anomaly acts as an external field applied to the chiral condensate in a color superconductor and, as a new critical point emerges, leads to a crossover between the broken chiral symmetry and color superconducting phases. At intermediate densities where both chiral and diquark condensates are present, we derive a generalized Gell-Mann- Oakes-Renner relation between the masses of pseudoscalar bosons and the magnitude of the chiral and diquark-condensates. We show explicitly the continuity of the ordinary pion at low densities to a generalized pion at high densities.

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