RIGHT-HANDED SNEUTRINO CURVATON AND NON-GAUSSIANITY

In this paper, we explore the parameter space for a Right-Handed (RH) sneutrino curvaton that can generate large non-gaussianity without assuming any particular inflation sector. The mass of the RH sneutrino is suggested from a discussion on the initial condition of the curvation field. It is shown that a small Yukawa coupling is generally required for a successful RH sneutrino curvaton. However, the Yukawa coupling can be larger if we consider the braneworld scenario. Some general discussion about the spectral index in curvation scenario is also provided.