无序瞬子媒质中的两胶子凝聚

无序瞬子媒质中的两胶子凝聚 TWO-GLUON CONDENSATES IN THE INSTANTON MEDIUM OF A DISORDERED PHASE 杨平雄 Yang Pingxiong 1 first-author 刘觉平 Liu Jueping 1 武汉大学物理学系 武汉大学物理学系 Department of Physics, Wuhan University Department of Physics, Wuhan University 在量子色动力学（ＱＣＤ）瞬子真空模型中，研究了ＳＵｃ（２）、ＳＵｃ（３）规范场论中两胶子凝聚的温度依赖关系．用费曼变分原理和平均场近似方法，发现两胶子凝聚随温度升高而衰减，在Ｔ≈４．ＳＡｍｓ时，凝聚几乎消失；色磁凝聚和色电凝聚的干涉部分同非干涉部分相比，虽然比较小，但在低温区不可忽略． We investigate the temperature dependence of the two-gluon condensates for the pure SUe（2）,SUc（3） gauge field theories in the instanton model of the QCD vacuum. Using Feynman variational principle and mean-field approximation, the values of twogluon condensates are found to be decreasing with the temperature and vanishing at T sc 4. SAme for Nc = 3. Compared with their non-interference ones, the interference parts of both chromomagnetic and chromoelectric condensates are insignificant but cannot be neglected at thirlow temperatures. 量子色动力学 瞬子媒质 两胶子凝聚 quantum chromodynamics instanton medium two-gluon condensates O572.2 国家自然科学基金(61672102) 1995-01-01 2021-04-01 1