Finite Temperature Effective Potential for Spontaneously Broken $\lambda {\Phi }^4$ Theory

Abstract

We present a self-consistent calculation of the finite temperature effective potential for $\lambda {\Phi }^4$ theory in four dimensions using a composite operator effective action. We find that in a spontaneously broken theory not only the so-called daisy and superdaisy graphs contribute to the next-to-leading order thermal mass, but also resummed non-local diagrams are of the same order, thus altering the effective potential at small effective mass.

Comments: 5 pages, Talk held at the 'Workshop on Quantum Infrared Physics', 6-8 June at Paris