电场背景下手征相变的临界线  

The critical lines of the chiral phase transition in an electric field background

作　　者：陈建兴[1] 魏颖 常晓婷 张肖阳 CHEN Jianxing;WEI Ying;CHANG Xiaoting;ZHANG Xiaoyang(School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2022年第3期314-322,共9页Journal of Liaoning Normal University:Natural Science Edition

基　　金：辽宁师范大学理论物理学术交流和人才培养建设平台项目(12047570)。

摘　　要：利用具有三个味道的NJL模型研究了恒定电场对强相互作用物质手征相变的影响.为确定电场-温度平面的相变临界线,采用了热磁化率、电磁化率和手征磁化率等几种不同的磁化率.计算表明:相变为平滑过渡,电场的增强加快了手征对称性的恢复,u夸克的手征对称性恢复要比d夸克快;利用不同磁化率的峰值确定的相变临界线存在差异,在电场-温度平面上临界线的中部差异比较明显;在NJL模型下,使用夸克有效质量与夸克凝聚定义的磁化率得到的临界点相同.The effect of uniform electric field on the chiral phase transition in strongly interacting matter is investigated by using an NJL model with three flavors. To determine the critical line in the electric field-temperature plane, different susceptibilities such as thermal susceptibility, electric susceptibility and chiral susceptibility are taken into account. The results show that the phase transition is a smooth crossover, the enhancement of the electric field can accelerate the chiral symmetry restoration and the chiral symmetry restoration of the u quark is faster than that of the d quark;the critical lines determined by different susceptibility show difference, which is more prominent in the central part of the critical lines;in the NJL model frame, the susceptibility defined by the quark effective mass gave the same result as defined by the quark condensate.

关 键 词：NJL模型 手征相变 磁化率 电场背景 

分 类 号：O572.33[理学—粒子物理与原子核物理]