1/N-c expansion for the partition function in four-fermion models

被引：5
|
作者：
Barducci, A
Casalbuoni, R
Modugno, M
Pettini, G
Gatto, R
机构：
[1] IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY
[2] UNIV GENEVA, DEPT PHYS THEOR, CH-1211 GENEVA, SWITZERLAND
来源：
MODERN PHYSICS LETTERS A | 1996年 / 11卷 / 19期
关键词：
D O I：
10.1142/S0217732396001570
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a derivation of the bosonic contribution to the thermodynamical potential of four-fermion models by means of a 1/N-c-expansion of the functional integral defining the partition function. This expansion turns out to be particularly useful in correcting the mean field approximation especially at low temperatures, where the relevant degrees of freedom are low-mass bosonic excitations (pseudo-Goldstones).
引用
收藏
页码：1579 / 1587
页数：9
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