Hilltop Inflation

Details Hilltop Inflation Hilltop Inflation

2005-02-04

arxiv.org/abs/hep-ph/0502047v2

JCAP 0507 (2005) 010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 20 pages, 5 figures. Minor changes, references added

Scientific paper

10.1088/1475-7516/2005/07/010

We study `hilltop' inflation, in which inflation takes place near a maximum of the potential. Viewed as a model of inflation after the observable Universe leaves the horizon (observable inflation) hilltop inflation is rather generic. If the potential steepens monotonically, observable hilltop inflation gives a tiny tensor fraction (r< 0.002). The usual F- and D-term models may easily be transmuted to hilltop models by Planck-suppressed terms, making them more natural. The only commonly-considered model of observable inflation which is definitely not hilltop is tree-level hybrid inflation. Viewed instead as an initial condition, we explain that hilltop inflation is more generic than seems to have been previously recognized, adding thereby to the credibility of the idea that eternal inflation provides the pre-inflationary initial condition.

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