Can we have inflation with Omega > 1?

Details Can we have inflation with Omega > 1? Can we have inflation with Omega > 1?

2003-03-12

arxiv.org/abs/astro-ph/0303245v2

JCAP 0305:002,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figs., based on the talk given at the conference COSMO-01, September 4, 2001, Rovaniemi, Finland; discussion of the

Scientific paper

10.1088/1475-7516/2003/05/002

It is very difficult to obtain a realistic model of a closed inflationary universe. Even if one fine-tunes the total number of e-folds to be sufficiently small, the resulting universe typically has large density perturbations on the scale of the horizon. We describe a class of models where this problem can be resolved. The models are unattractive and fine-tuned, so the flatness of the universe remains a generic prediction of inflationary cosmology. Nevertheless one should keep in mind that with the fine-tuning at the level of about one percent one can obtain a semi-realistic model of a closed inflationary universe. The spectrum of density perturbations in this model may have a cut-off on the scale of the horizon. Similar approach may be valid in application to a compact inflationary universe with a nontrivial topology.

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