Curvaton potential terms, scale-dependent perturbation spectra and chaotic initial conditions

John McDonald
2003 Journal of Cosmology and Astroparticle Physics  
The curvaton scenario predicts an almost scale-invariant spectrum of perturbations in most inflation models. We consider the possibility that renormalisable phi^4 or Planck scale-suppressed non-renormalisable curvaton potential terms may result in an observable deviation from scale-invariance. We show that if the curvaton initially has a large amplitude and if the total number of e-foldings of inflation is less than about 300 then a running blue perturbation spectrum with an observable
more » ... observable deviation from scale-invariance is likely. D-term inflation is considered as an example with a potentially low total number of e-foldings of inflation. A secondary role for the curvaton, in which it drives a period of chaotic inflation leading to D-term or other flat potential inflation from an initially chaotic state, is suggested.
doi:10.1088/1475-7516/2003/12/005 fatcat:sn4up2jibvbaphqmhssfxyp2x4