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arXiv 1302.0622hep-ph
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有限温度、化学势和强磁场下的双味色超导

Two-flavor color superconductivity at finite temperature, chemical potential and in the presence of strong magnetic fields

Sh. Fayazbakhsh, N. Sadooghi

摘要:

利用扩展的双味Nambu-JonaLasinio(NJL)模型,研究了QCD相图中中等重子密度下外加磁场对双味色超导相(2SC)的影响.扩展的NJL模型的有效作用量由两个质量隙组成,这两个质量隙是温度、夸克化学势和外部磁场三个强度量的函数。质量间隙的非零值,手征和双夸克凝聚,诱导自发的手征和色对称性破缺,分别,并作为一个结果,两个不同阶段的夸克物质出现。我们找到了这些相位之间的过渡曲线以及QCD相图中的临界点。在这两个相上施加一个恒定的强磁场,我们发现质量隙随着磁场的增加而增加,QCD相图中的对称性破缺区域甚至扩大到更大的温度和夸克化学势值。这种现象是磁催化动力学对称性破缺的结果,这在以前已经被证明。

英文摘要:

Utilizing an extended two-flavor Nambu-Jona Lasinio (NJL) model, we review some of the effects of external magnetic fields on two-flavor color superconducting phase (2SC) at moderate baryon densities in the QCD phase diagram. The effective action of the extended NJL model consists of two mass gaps as functions of three intensive quantities, the temperature, the quark chemical potential and the external magnetic field. The nonzero values of the mass gaps, chiral and diquark condensates, induce spontaneous chiral and color symmetry breaking, respectively, and as a result two different phases of quark matter appear. We find the transition curves between these phases as well as the critical points in the QCD phase diagram in terms of the intensive quantities. Imposing a constant strong magnetic field on these two phases, we show that the mass gaps increase with the magnetic field and the symmetry breaking region in the QCD phase diagram expands even to the larger values of temperature and quark chemical potential. This phenomenon is a consequence of the magnetic catalysis of dynamical symmetry breaking, which is proven before.

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