Instantons and the fixed point topological charge in the two-dimensional O(3) sigma model

被引：62

作者：

Blatter, M

Burkhalter, R

Hasenfratz, P

Niedermayer, F

机构：

[1] Institut für Theoretische Physik, Universität Bern, Bern, CH-3012, Sidlerstrasse 5

来源：

PHYSICAL REVIEW D | 1996年 / 53卷 / 02期

关键词：

D O I：

10.1103/PhysRevD.53.923

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We define a fixed point topological charge for the two-dimensional O(3) lattice sigma model which is free of topological defects. We use this operator in combination with the fixed point action to measure the topological susceptibility for a wide range of correlation lengths. The results strongly suggest that it is not a physical quantity in this model. The procedure, however, can be applied to other asymptotically free theories as well.

引用

页码：923 / 932

页数：10

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