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arXiv 1507.02527hep-phhep-th
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外磁场中Nambu-Jona-Lasinio模型的泛函重整化群研究

Functional renormalization group study of the Nambu--Jona-Lasinio model at finite temperature and density in an external magnetic field

Ken-Ichi Aoki, Hidenari Uoi, Masatoshi Yamada

摘要:

本文利用泛函重整化群研究了外磁场中有限温度和有限密度下的Nambu-Jona-Lasinio(NJL)模型.我们研究了四费米耦合常数的紫外固定点(UVFP)的位置与温度、密度和外加磁场的关系,得到了手征相结构.在低温和有限化学势下,UVFP在外加小磁场中振荡,这可以解释为deHaas-van Alphen效应。我们还得到了具有复杂结构的相图,在低温高密度区,随着外部磁场的增加,相边界来回移动。

英文摘要:

In this study, we investigate the Nambu--Jona-Lasinio (NJL) model at finite temperature and finite density in an external magnetic field using the functional renormalization group. We investigate the dependence of the position of the ultraviolet fixed point (UVFP) of the four-Fermi coupling constant on the temperature, density, and external magnetic field, and we obtain the chiral phase structure. The UVFP at low temperature and finite chemical potential oscillates in a small external magnetic field, which can be interpreted as the de Haas--van Alphen effect. We also obtain phase diagrams with complex structures, where the phase boundary moves back and forth as the external magnetic field increases in the low temperature and high density region.

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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