Critical phenomena from the two-particle irreducible 1/N expansion -: art. no. 125002

被引：29

作者：

Alford, M

Berges, J

Cheyne, JM

机构：

[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[2] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

[3] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

来源：

PHYSICAL REVIEW D | 2004年 / 70卷 / 12期

关键词：

D O I：

10.1103/PhysRevD.70.125002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The 1/N expansion of the two-particle irreducible (2PI) effective action is employed to compute universal properties at the 2nd order phase transition of an O(N)-symmetric N-vector model directly in three-dimensions. At next-to-leading-order the approach cures the spurious small-N divergence of the standard (1PI) 1/N expansion for a computation of the critical anomalous dimension eta(N), and leads to improved estimates already for moderate values of N.

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页码：125002 / 1

页数：9

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