Inflation without Inflaton(s)

Details Inflation without Inflaton(s) Inflation without Inflaton(s)

2006-10-05

arxiv.org/abs/hep-th/0610054v3

JCAP0711:017,2007

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, 4 figures, published version

Scientific paper

10.1088/1475-7516/2007/11/017

We propose a model for early universe cosmology without the need for fundamental scalar fields. Cosmic acceleration and phenomenologically viable reheating of the universe results from a series of energy transitions, where during each transition vacuum energy is converted to thermal radiation. We show that this `cascading universe' can lead to successful generation of adiabatic density fluctuations and an observable gravity wave spectrum in some cases, where in the simplest case it reproduces a spectrum similar to slow-roll models of inflation. We also find the model provides a reasonable reheating temperature after inflation ends. This type of model may also be relevant for addressing the smallness of the vacuum energy today.

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