On the phase transition in the scalar theory

Details On the phase transition in the scalar theory On the phase transition in the scalar theory

1992-06-17

arxiv.org/abs/hep-ph/9206227v1

Phys.Lett.B291:115-124,1992

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 A4 pages, table and figures not included and available (by ordinary mail) upon request, plain LATEX, CERN-TH.6451/92, IEM-F

Scientific paper

10.1016/0370-2693(92)90129-R

The basic tool for the study of the electroweak phase transition is $V_{eff} (\phi,T)$, the one-loop finite-temperature effective potential, improved by all-loop resummations of the most important infrared contributions. In this paper we perform, as a first step towards a full analysis of the Standard Model case, a detailed study of the effective potential of the scalar theory. We show that subleading corrections to the self-energies lead to spurious terms, linear in the field-dependent mass $m(\phi)$, in the daisy-improved effective potential. Consistency at subleading order requires the introduction of superdaisy diagrams, which prevent the appearance of linear terms. The resulting $V_{eff}(\phi,T)$ for the scalar theory hints at a phase transition which is either second-order or very weakly first-order.

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