The TeV mass curvaton
- Physics Department, University of Helsinki, FI-00014, Helsinki (Finland)
- Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)
- Helsinki Institute of Physics, University of Helsinki, FI-00014, Helsinki (Finland)
We consider the constraints for a curvaton with mass m ∼ O(1) TeV and show that they are not consistent with a purely quadratic potential. Even if the curvaton self-interactions 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 TeV-mass 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{sub int} = σ{sup 8}/M{sup 4}. The decay width of the curvaton should be in the range Γ = 10{sup −15}−10{sup −17} GeV. The model typically predicts large non-linearity parameters f{sub NL} and g{sub NL} that should be observable by the Planck satellite. We also discuss various physical possibilities to obtain the required small curvaton decay rate.
- OSTI ID:
- 22275439
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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