DBI-Curvaton

Details DBI-Curvaton DBI-Curvaton

2008-06-14

arxiv.org/abs/0806.2363v2

Phys.Lett.B671:423-427,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, several references added

Scientific paper

10.1016/j.physletb.2008.12.056

In this paper, we study a curvaton model described by a Dirac-Born-Infeld-like action. We calculate the spectrum of curvature perturbation induced by DBI-curvaton and estimate its non-Gaussianity. We find that in the limit of low sound speed the amplitude of curvature perturbation is enhanced more than that in DBI inflation. This result also means that the inflationary scale with DBI-curvaton may be lower than that in usual curvaton model. In addition, we also find that the local non-Gaussianity level in DBI-curvaton is generally about 10 times larger than that in usual curvaton model, which is interesting for current observations. This work in some sense explores a new application of brane-cosmology in inflation.

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