Curvaton paradigm can accommodate multiple low inflation scales

Details Curvaton paradigm can accommodate multiple low inflation scales Curvaton paradigm can accommodate multiple low inflation scales

2003-12-04

arxiv.org/abs/hep-ph/0312058v2

Class.Quant.Grav. 21 (2004) L11-L16

Physics

High Energy Physics

High Energy Physics - Phenomenology

9pages, no figure, references added, final version

Scientific paper

10.1088/0264-9381/21/4/L02

Recent arguments show that some curvaton field may generate the cosmological curvature perturbation. As the curvaton is independent of the inflaton field, there is a hope that the fine-tunings of inflation models can be cured by the curvaton scenario. More recently, however, D.H.Lyth discussed that there is a strong bound for the Hubble parameter during inflation even if one assumes the curvaton scenario. Although the most serious constraint was evaded, the bound seems rather crucial for many models of a low inflation scale. In this paper we try to remove this constraint. We show that the bound is drastically modified if there were multiple stages of inflation.

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