电场背景下强相互作用物质的手征相变  

Chiral phase transition of strongly interacting matter in an electric field background

作　　者：陈建兴[1] 张肖阳 夏晓晗 黄俊文 CHEN Jianxing;ZHANG Xiaoyang;XIA Xiaohan;HUANG Junwen(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）》2021年第2期174-182,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：从具有两个味道、超出平均场近似的NJL模型出发,使用OPT方法研究了在有限温度和化学势下,匀强电场对强相互作用物质手征相变的影响.结果表明,电场的增强使夸克的有效质量和夸克凝聚减小,系统从手征对称性自发破缺相连续转变为手征对称性恢复相.电场增强导致u,d夸克凝聚的劈裂变大.随着电场增强,有效质量和夸克凝聚对化学势和温度的敏感性降低.OPT方法下得到的手征相变定性结论与平均场近似下的计算结果一致.Based on the NJL model with two flavors and beyond the mean field approximation,the effect of uniform electric field on the chiral phase transition of strongly interacting matter at finite temperature and chemical potential is investigated by OPT method.The results show that the effective mass and condensation of quarks are reduced by the enhancement of electric field,and chiral symmetry of the system restores from chiral symmetry spontaneous breaking phase.The increasing electric field leads to larger splitting between u,d quark condensation.The sensitivity of quark condensation to chemical potential and temperature decreases with the enhancement of electric field.The results under the OPT method is consistent qualitatively with those obtained under the mean field approximation.

关 键 词：电场背景 NJL模型 OPT方法 手征相变 

分 类 号：O572.33[理学—粒子物理与原子核物理]