arXiv 0709.22042007-09-14hep-ph

零温和有限温下手征相和/或色超导相双味夸克物质的铁磁性

Ferromagnetism of two-flavor quark matter in chiral and/or color-superconducting phases at zero and finite temperatures

M. Inui, H. Kohyama, A. Niégawa

备注：: 25 pages, 10 figures

摘要：

本文在Nambu-Jona-Lasinio（NJL）模型下研究了零温和有限温下非极化和极化双味夸克物质的相结构。我们的重点是该地区，其中包括共存的夸克-反夸克和双夸克凝聚相。推广的NJL模型，以描述极化夸克物质，我们计算的热力学势作为夸克化学势（$μ$），温度（$T$），和极化参数的函数。结果很大程度上取决于比率$G_D / G_S$，其中$G_S$是夸克-反夸克耦合常数，$G_D$是双夸克耦合常数。我们发现，对于小的$G_D / G_S$，“铁磁”相是积极的“顺磁”相的青睐。另一方面，对于大的$G_D / G_S$，在（$μ, T$）-平面中出现窗口，其中“顺磁”相是有利的。

英文摘要：

We study the phase structure of the unpolarized and polarized two-flavor quark matters at zero and finite temperatures within the Nambu--Jona-Lasinio (NJL) model. We focus on the region, which includes the coexisting phase of quark-antiquark and diquark condensates. Generalizing the NJL model so as to describe the polarized quark matter, we compute the thermodynamic potential as a function of the quark chemical potential ($μ$), the temperature ($T$), and the polarization parameter. The result heavily depends on the ratio $G_D / G_S$, where $G_S$ is the quark-antiquark coupling constant and $G_D$ is the diquark coupling constant. We find that, for small $G_D / G_S$, the "ferromagnetic" phase is energetically favored over the "paramagnetic" phase. On the other hand, for large $G_D / G_S$, there appears the window in the ($μ, T$)-plane, in which the "paramagnetic" phase is favored.

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