A Toy Model for Open Inflation

Abstract

The open inflation scenario based on the theory of bubble formation in the models of a single scalar field suffered from a fatal defect. In all the versions of this scenario known so far, the Coleman-De Luccia instantons describing the creation of an open universe did not exist. We propose a simple one-field model where the CDL instanton does exist and the open inflation scenario can be realized.

Comments: 7 pages, 4 figures, revtex, a discussion of density perturbations is extended