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arXiv 0908.0594hep-ph
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流质量对空间非均匀手征凝聚体的影响

Influence of current mass on the spatially inhomogeneous chiral condensate

Shinji Maedan

摘要:

在平均场近似下,Nambu-Jona-Lasinio(NJL)模型在有限密度下,在手征极限下会出现空间不均匀的手征凝聚。本文研究了引入流夸克质量对空间非均匀手征凝聚体的基态的影响。数值计算表明,即使引入当前夸克质量,也可以产生空间非均匀的手征凝聚。为了得到系统的基态,采用平均场近似计算了系统的热力学势。有限流质量对热力学势的影响包括两个方面。一部分来自凝聚体的场能,这有利于非均匀手征凝聚体。另一部分来自狄拉克海和费米海,有利于形成均匀的手征凝聚。我们还发现,当出现空间非均匀手征凝聚时,重子数密度变得空间非均匀。

英文摘要:

It is known that, in the chiral limit, spatially inhomogeneous chiral condensate occurs in the Nambu-Jona-Lasinio (NJL) model at finite density within a mean-field approximation. We study here how an introduction of current quark mass affects the ground state with the spatially inhomogeneous chiral condensate. Numerical calculations show that, even if the current quark mass is introduced, the spatially inhomogeneous chiral condensate can take place. In order to obtain the ground state, the thermodynamic potential is calculated with a mean-field approximation. The influence of finite current mass on the thermodynamic potential consists of following two parts. One is a part coming from the field energy of the condensate, which favors inhomogeneous chiral condensate. The other is a part coming from the Dirac sea and the Fermi sea, which favors homogeneous chiral condensate. We also find that when the spatially inhomogeneous chiral condensate occurs, the baryon number density becomes spatially inhomogeneous.

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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