Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10721926 | Physics Letters B | 2011 | 4 Pages |
Abstract
In general, for single field, the scale invariant spectrum of curvature perturbation can be given by either its constant mode or its increasing mode. We show that during slowly expanding or contracting, the spectrum of curvature perturbation given by its increasing mode can be scale invariant. The perturbation mode can be naturally extended out of horizon, and the amplitude of perturbation is consistent with the observations. We briefly discuss the implement of this scenario.
Keywords
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Authors
Yun-Song Piao,