KOSTERLITZ-THOULESS PHASE-TRANSITION IN THE 2-DIMENSIONAL LINEAR SIGMA-MODEL

被引：81

作者：

GRATER, M

WETTERICH, C

机构：

[1] Institut für Theoretische Physik, Universität Heidelberg, 69120 Heidelberg

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.75.378

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the O(N) symmetric linear sigma model in two dimensions by means of an exact nonperturbative evolution equation. The perturbative infrared divergences are absent in this formulation. We use a simple approximative solution of the flow equation which corresponds to a derivative expansion for the effective action. For N = 2 this gives a good picture of the Kosterlitz-Thouless phase transition.

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页码：378 / 381

页数：4

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