QCD with large number of quarks: effects of the instanton-anti-instanton pairs

被引：49
|
作者：
Velkovsky, M [1 ]
Shuryak, E [1 ]
机构：
[1] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA
来源：
PHYSICS LETTERS B | 1998年 / 437卷 / 3-4期
关键词：
D O I：
10.1016/S0370-2693(98)00930-7
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the contribution of instanton - anti-instanton (I (I) over bar) pairs to the vacuum energy of QCD-like theories with N-f light fermions, using the saddle point method. A qualitative change of behavior is found around N-f = 6. We discuss the relation of this phenomenon to the mechanism of chiral symmetry breaking and the asymptotic of the perturbative series associated with I (I) over bar contributions. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
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页码：398 / 402
页数：5
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