Non-minimally coupled curvaton

Understand

We investigate two-field inflationary models in which scalar cosmological pertubations are generated via a spectator field nonminimally coupled to gravity, with the particular emphasis on curvaton scenarios.

• The principal advantage of these models is in the possibility to tune the spectator spectral index via the nonminimal coupling.
• Our models naturally yield red spectrum of the adiabatic perturbation demanded by observations.
• We study how the nonminimal coupling affects the spectrum of the curvature perturbation generated in the curvaton scenarios.