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arXiv 1503.00452hep-ph
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外磁场作用下NJL模型的手征对称性动力学破缺

Dynamical chiral symmetry breaking in the NJL model with a constant external magnetic field

Song Shi, You-Chang Yang, Yong-Hui Xia, Zhu-Fang Cui, Xiao-Jun Liu, Hong-Shi Zong

摘要:

本文发展了一种不同于Schwinger本征时间方法的新方法,导出了在恒定外磁场作用下的费米子传播子。在NJL模型中,我们用这种方法求出了零温和非零温时的带隙方程,并给出了数值结果和磁场与温度的相图。此外,我们还引入了电流质量来研究系统的磁化率,因为电流质量中引入了一个新的参数在这个问题中,我们定义了一个新的磁化率$χ_B$,并与其它两个磁化率$χ_c$进行了比较(手性磁化率)和$χ_T$(热磁化率),并且所有三个磁化率都显示当电流质量不为零时,相变是交叉的,而为了比较,在手征极限下,结晶性显示出二级相变。最后给出了在手征极限下不同磁化率的临界系数。

英文摘要:

In this paper we develop a new method that is different from Schwinger proper time method to deduce the fermion propagator with a constant external magnetic field. In the NJL model, we use this method to find out the gap equation at zero and non-zero temperature, and give the numerical results and phase diagram between magnetic field and temperature. Beside these, we also introduce current mass to study the susceptibilities, because there is a new parameter (the strength of external magnetic field) in this problem, corresponding this new parameter, we have defined a new susceptibility $χ_B$ to compare with the other two susceptibilities $χ_c$ (chiral susceptibility) and $χ_T$ (thermal susceptibility), and all of the three susceptibilities show than when current mass is not zero, the phase transition is a crossover, while for comparison, in the chiral limit, the susceptibilities show a second order phase transition. At last, we give out the critical coefficients of different susceptibilities in the chiral limit.

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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