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Non-Gaussianity, isocurvature perturbation, gravitational waves, and a no-go theorem for the isocurvaton

Authors Li, Miao
Lin, Chunshan
Wang, Tower
Wang, Yi View this author's profile
Issue Date 2009
Source Physical Review D , v. 79, (6), March 2009
Summary We investigate the isocurvaton model, in which the isocurvature perturbation plays a role in suppressing the curvature perturbation, and large non-Gaussianity and gravitational waves can be produced with no isocurvature perturbation for dark matter. We show that in the slow-roll noninteracting multifield theory, the isocurvaton mechanism cannot be realized. This result can also be generalized to most of the studied models with generalized kinetic terms. We also study the implications for the curvaton model. We show that there is a combined constraint for curvaton on non-Gaussianity, gravitational waves, and isocurvature perturbation. The technique used in this paper can also help to simplify some calculations in the mixed inflaton and curvaton models. We also investigate the possibility of producing large negative non-Gaussianity and nonlocal non-Gaussianity in the curvaton model.
ISSN 2470-0010
Rights © 2009 American Physical Society
Language English
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