Effective Action Method for Computing Next to Leading Corrections of $O(N)$ Models

Abstract

We compute the corrections of next to leading order in the $\frac{1}{N}$ expansion to the effective potential of a system described by a Ginzburg-Landau model with $N$ components and quartic interaction, in the case of spontaneous symmetry breaking. The method we apply allows to generalize in a simple way the so-called Self-Consistent Screened Approximation (SCSA).

p. 8, LATEX, DFF 193/9/1993

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