Density perturbations from modulated decay of the curvaton

Journal Article · Mon Apr 01 04:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/04/014· OSTI ID:22282996

Langlois, David ^[1]; Takahashi, Tomo ^[2]

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1. APC (CNRS-Université Paris 7), 10, rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13 (France)
2. Department of Physics, Saga University, Saga 840-8502 (Japan)

We study density perturbations, including their non-Gaussianity, in models in which the decay rate of the curvaton depends on another light scalar field, denoted the modulaton. Although this model shares some similarities with the standard curvaton and modulated reheating scenarios, it exhibits interesting predictions for f{sub NL} and g{sub NL} that are specific to this model. We also discuss the possibility that both modulaton and curvaton fluctuations contribute to the final curvature perturbation. Our results naturally include the standard curvaton and modulated reheating scenarios as specific limits and are thus useful to present a unified treatment of these models and their variants.

• OSTI ID: 22282996
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGY
DENSITY
DISTURBANCES
FLUCTUATIONS
INFLATIONARY UNIVERSE
INFLATONS
PERTURBATION THEORY
SCALAR FIELDS
VISIBLE RADIATION