A DISORDER-DEPENDENT VARIATIONAL METHOD WITHOUT REPLICAS - APPLICATION TO THE RANDOM-PHASE SINE-GORDON MODEL

被引：17
|
作者：
ORLAND, H
SHAPIR, Y
机构：
[1] CE SACLAY,SERV PHYS THEOR,F-95806 CERGY,FRANCE
[2] UNIV CERGY PONTOISE,PHYS STAT GRP,F-95806 CERGY,FRANCE
[3] UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627
来源：
EUROPHYSICS LETTERS | 1995年 / 30卷 / 04期
关键词：
D O I：
10.1209/0295-5075/30/4/003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A Gaussian variational approach is applied to the random phase sine-Gordon model. The effect of the disorder appears through a scale-dependent random mass term. Some of the results of the replica-symmetry-broken variational solution are reproduced. This variational principle, however, gives a true upper bound to the free energy, and predicts new results. In particular, essential differences are found between the situation in which the phases are pinned on the boundary and that in which they are free.
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页码：203 / 208
页数：6
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