Inhomogeneous Field Configurations and the Electroweak Phase Transition

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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23 pages of LaTeX + 3 PostScript figures included in uuencoded form, FERMI-PUB-93/253-T

Scientific paper

10.1103/PhysRevD.49.3869

We investigate the effects of inhomogeneous scalar field configurations on the electroweak phase transition. For this purpose we calculate the leading perturbative correction to the wave function correction term $Z(\vph,T)$, i.e., the kinetic term in the effective action, for the electroweak Standard Model at finite temperature and the top quark self--mass. Our finding for the fermionic contribution to $Z(\vph,T)$ is infra--red finite and disagrees with other recent results. In general, neither the order of the phase transition nor the temperature at which it occurs change, once $Z(\vph,T)$ is included. But a non--vanishing, positive (negative) $Z(\vph,T)$ enhances (decreases) the critical droplet surface tension and the strength of the phase transition. We find that in the range of parameter space, which allows for a first--order phase transition, the wave function correction term is negative --- indicating a weaker phase transition --- and especially for small field values so large that perturbation theory becomes unreliable.

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