Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-16
Phys.Rev. D43 (1991) 353-361
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 2 figures, This early paper is being placed on the archive to make it more easily accessible in light of recent inte
Scientific paper
10.1103/PhysRevD.43.353
We present an inflationary universe model which utilizes two coupled real scalar fields. The inflation field $\phi$ experiences a first order phase transition and its potential dominates the energy density of the Universe during the inflationary epoch. This field $\phi$ is initially trapped in its metastable minimum and must tunnel through a potential barrier to reach the true vacuum. The second auxiliary field $\psi$ couples to the inflaton field and serves as a catalyst to provide an abrupt end to the inflationary epoch; i.e., the $\psi$ field produces a time-dependent nucleation rate for bubbles of true $\phi$ vacuum. In this model, we find that bubbles of true vacuum can indeed percolate and we argue that thermalization of the interiors can more easily take place. The required degree of flatness (i.e., the fine tuning) in the potential of the $\psi$ field is comparable to that of other models which invoke slowly rolling fields. Pseudo Nambu-Goldstone bosons may naturally provide the flat potential for the rolling field.
Adams Fred C.
Freese Katherine
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