THE AVERAGE FREE-ENERGY AND THE EFFECTIVE MEAN FIELD HYPOTHESIS

被引：9
|
作者：
SONG, YX [1 ]
ZHOU, SK [1 ]
ZHAO, PY [1 ]
机构：
[1] ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA
来源：
COMMUNICATIONS IN THEORETICAL PHYSICS | 1992年 / 17卷 / 04期
关键词：
D O I：
10.1088/0253-6102/17/4/421
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this paper, an improvement in the variational-cumulant expansion method is made. For any model in lattice field theories, the average free energy can be calculated rigorously according to the generalized cumulant expansion, and the intensity of the effective external field can be determined by the effective mean field hypothesis. As a test, the Ising model is studied, and the results take a visible turn for the better.
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页码：421 / 424
页数：4
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