High Temperature Phase Transitions in Two-Scalar Theories with Large $N$ Techniques

Details High Temperature Phase Transitions in Two-Scalar Theories with Large $N$ Techniques High Temperature Phase Transitions in Two-Scalar Theories with Large $N$ Techniques

1994-09-02

arxiv.org/abs/hep-th/9409010v1

Phys.Lett.B347:120-130,1995

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, LaTex, includes 5 uuencoded postscript figures, OUTP-94-11 P

Scientific paper

10.1016/0370-2693(95)00044-L

We consider a theory of a scalar one-component field $\phi$ coupled to a scalar $N$-component field $\chi$. Using large $N$ techiques we calculate the effective potential in the leading order in $1/N$. We show that this is equivalent to a resummation of an infinite subclass of graphs in perturbation theory, which involve fluctuations of the $\chi$ field only. We study the temperature dependence of the expectation value of the $\phi$ field and the resulting first and second order phase transitions.

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