Sine-Gordon expectation values of exponential fields with variational perturbation theory

被引：5
|
作者：
Lu, WF [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Phys, Inst Theoret Phys, Shanghai 200030, Peoples R China
[2] Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy
来源：
PHYSICS LETTERS B | 2004年 / 602卷 / 3-4期
基金：
中国国家自然科学基金;
关键词：
one-point function; sine-Gordon field theory; variational perturbation approach; non-perturbation quantum field theory;
D O I：
10.1016/j.physletb.2004.10.001
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this Letter, expectation values of exponential fields in the 2-dimensional Euclidean sine-Gordon field theory are calculated with variational perturbation approach up to the second order. Our numerical analysis indicates that for not large values of the exponential -field parameter a, our results agree very well with the exact formula conjectured by Lukyanov and Zamolodchikov [Nucl. Phys. B 493 (1997) 571]. (C) 2004 Elsevier B.V. All rights resreved.
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页码：261 / 268
页数：8
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