Thermodynamical Bathe Ansatz analysis in an SU(2) x U(1) symmetric σ-model

被引：10
|
作者：
Balog, J [1 ]
Forgács, P [1 ]
机构：
[1] Univ Tours, Lab Math & Phys Theor, F-37200 Tours, France
来源：
NUCLEAR PHYSICS B | 2000年 / 570卷 / 03期
基金：
匈牙利科学研究基金会;
关键词：
D O I：
10.1016/S0550-3213(99)00754-3
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：
Four different types of free energies are computed by both thermodynamical Bethe Ansatz (TBA) techniques and by weak coupling perturbation theory in an integrable one-parameter deformation of the O(4) principal chiral sigma-model (with SU(2)X U(1) symmetry). The model exhibits both 'fermionic' and 'bosonic' type free energies and in all cases the perturbative and the TEA results are in perfect agreement, strongly supporting the correctness of the proposed S matrix, The mass gap is also computed in terms of the ii parameters of the modified minimal subtraction scheme and a lattice regularized version of the model, (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：655 / 684
页数：30
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