The TeV mass curvaton

Kari Enqvist; Anupam Mazumdar; Olli Taanila

doi:10.1088/1475-7516/2010/09/030

The TeV mass curvaton

Kari Enqvist, Anupam Mazumdar, Olli Taanila

7 Citationer (Scopus)

Abstract

We consider the constraints for a curvaton with mass m ∼ (1) Ο TeV and showthat they are not consistent with a purely quadratic potential. Even if the curvaton selfinteractions are very weak, they must be accounted for as they affect the dynamical evolution of the curvature perturbation. We show that the only monomial self-interaction for a TeVmass curvaton that (a) yields the correct perturbation amplitude, (b) decays before the dark matter freeze-out, and (c) does not give rise to non-Gaussian perturbations that would be in conflict with the present limits, is given by V_int = σ⁸/M⁴. The decay width of the curvaton should be in the range Γ = 10^-15 - 10^-17GeV. The model typically predicts large nonlinearity parameters f_NL and g_NL that should be observable by the Planck satellite. We also discuss various physical possibilities to obtain the required small curvaton decay rate.

Originalsprog	Engelsk
Tidsskrift	Journal of Cosmology and Astroparticle Physics
Vol/bind	2010
Udgave nummer	9
Sider (fra-til)	030
ISSN	1475-7516
DOI	https://doi.org/10.1088/1475-7516/2010/09/030
Status	Udgivet - 27 sep. 2010

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10.1088/1475-7516/2010/09/030

Citationsformater

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T1 - The TeV mass curvaton

AU - Enqvist, Kari

AU - Mazumdar, Anupam

AU - Taanila, Olli

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N2 - We consider the constraints for a curvaton with mass m ∼ (1) Ο TeV and showthat they are not consistent with a purely quadratic potential. Even if the curvaton selfinteractions are very weak, they must be accounted for as they affect the dynamical evolution of the curvature perturbation. We show that the only monomial self-interaction for a TeVmass curvaton that (a) yields the correct perturbation amplitude, (b) decays before the dark matter freeze-out, and (c) does not give rise to non-Gaussian perturbations that would be in conflict with the present limits, is given by Vint = σ8/M4. The decay width of the curvaton should be in the range Γ = 10-15 - 10-17GeV. The model typically predicts large nonlinearity parameters fNL and gNL that should be observable by the Planck satellite. We also discuss various physical possibilities to obtain the required small curvaton decay rate.

AB - We consider the constraints for a curvaton with mass m ∼ (1) Ο TeV and showthat they are not consistent with a purely quadratic potential. Even if the curvaton selfinteractions are very weak, they must be accounted for as they affect the dynamical evolution of the curvature perturbation. We show that the only monomial self-interaction for a TeVmass curvaton that (a) yields the correct perturbation amplitude, (b) decays before the dark matter freeze-out, and (c) does not give rise to non-Gaussian perturbations that would be in conflict with the present limits, is given by Vint = σ8/M4. The decay width of the curvaton should be in the range Γ = 10-15 - 10-17GeV. The model typically predicts large nonlinearity parameters fNL and gNL that should be observable by the Planck satellite. We also discuss various physical possibilities to obtain the required small curvaton decay rate.

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DO - 10.1088/1475-7516/2010/09/030

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JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

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The TeV mass curvaton

Abstract

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