摘要
用改进的蒙特卡洛重正化群方法讨论了二维随机三角点阵上O(3)σ模型的β函数行为.在弱耦合区的行为与二圈图微扰论的结果一致,g>0.8以后,β函数下降陡度突然增加,反映了高阶微扰项及非微扰项的贡献.
The β function behavior for o(3) σ model on 2-dimensional random triangle lattice has been studied with an improved Monte Carlo renormalization group method.It agrees with the one calculated in the weak coupling region under two loop approximation.However,when g>0.8,it drops down faster due to the higher-order perturbative and nonperturbative contributions.
出处
《高能物理与核物理》
SCIE
CAS
CSCD
北大核心
1989年第12期1079-1082,共4页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
