Testing the efficiency of different improvement programs

被引：5

作者：

Caracciolo, S

Montanari, A

Pelissetto, A

机构：

[1] Scuola Normale Super Pisa, I-56100 Pisa, Italy

[2] Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy

[3] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[4] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Roma 1, I-00185 Rome, Italy

来源：

NUCLEAR PHYSICS B | 1999年 / 556卷 / 1-2期

关键词：

improvement; sigma-model; perfect action; finite-size scaling; large-N expansion;

D O I：

10.1016/S0550-3213(99)00373-9

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study the finite-size behaviour of a tree-level on-shell improved action for the N-vector model. We present numerical results for N = 3 and analytic results in the large-N limit for the mass gap. We also report a perturbative computation at one loop of the mass gap for states of spatial momentum p. We present a detailed comparison of the behaviour of this action with that of other formulations, including the perfect action, and a critical discussion of the different approaches to the problem of action improvement. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：295 / 326

页数：32

共 64 条

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