On the Realization of Assisted Inflation

Details On the Realization of Assisted Inflation On the Realization of Assisted Inflation

1999-03-30

arxiv.org/abs/hep-ph/9903524v1

Phys.Rev.D60:043502,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, LaTeX file

Scientific paper

10.1103/PhysRevD.60.043502

We consider conditions necessary for a successful implementation of so-called assisted inflation. We generalize the applicability of assisted inflation beyond exponential potentials as originally proposed to include standard chaotic (\lambda \phi^4 or m^2 \phi^2) models as well. We also demonstrate that in a purely 4-dimensional theory, unless the assisted sector is in fact decoupled, the additional fields of the assisted sector actually impede inflation. As a specific example of an assisted sector, we consider a 5-dimensional KK model for which the extra dimension may be somewhat or much larger than the inverse Planck scale. In this case, the assisted sector (coming from a KK compactification) eliminates the need for a fine-tuned quartic coupling to drive chaotic inflation. This is a general result of models with one or more "large" extra dimensions.

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