摘要
借助于经典统计的累积展开,相同的步骤我们得到了量子系统的累积展开,对于二体弱的相互作用,累积与微扰理论相一致;对于有强斥力心的二体相互作用,累积项定义的Г(t)算符,其作用类同于经典统计的Mayer f函数.
The use of cumulant expansions in equilibrium classical statistical mechanics. An analogous procedure cumulant expansions in quantum systems. For soft two-body interactions, the cumulants give the same result as the perturbation theory. For two body interactions with a strong repulsive core, new cumulants defined in terms of the quantum analog of the Mager f-function of classical statistical are shown to yiold results equivalant to those obtianed using the Γ(t) operator of quantum mechanics.
出处
《信阳师范学院学报（自然科学版）》
CAS
1992年第2期169-175,共7页
Journal of Xinyang Normal University(Natural Science Edition)
关键词
累积展开
配分函数
统计力学
cnmulant expansions, partition function, time evolution operator
