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On the consistent solution of the gap--equation for spontaneously broken $λΦ^4$-theory

Herbert Nachbagauer
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Abstract

We present a self--consistent solution of the finite temperature gap--equation for $λΦ^4$ theory beyond the Hartree-Fock approximation 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 resummed mass, but also resummed non--local diagrams are of the same order, thus altering the effective mass for small values of the latter.

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Herbert Nachbagauer. 1994-10-07. On the consistent solution of the gap--equation for spontaneously broken $λΦ^4$-theory. https://doi.org/10.1007/bf01553991

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