Thermodynamics of the two-dimensional O(3) sigma-model with fixed-point lattice action

被引：8

作者：

Spiegel, S

机构：

[1] Inst. für Theoretische Physik, Universität Zürich, CH-8057 Zürich

来源：

PHYSICS LETTERS B | 1997年 / 400卷 / 3-4期

关键词：

cut-off effects; fixed-point action; cluster Monte Carlo study; RENORMALIZATION-GROUP;

D O I：

10.1016/S0370-2693(97)00346-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The free energy density of the two-dimensional O(3) non-linear sigma-model is calculated at finite temperature and finite spatial extent. Both an analytic calculation in the perturbative regime and a Monte Carlo study at low temperatures are presented. It is shown that using the fixed-point action instead of the standard Wilson action leads to a substantial reduction of the cut-off effects. (C) 1997 Elsevier Science B.V.

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页码：352 / 357

页数：6

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