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Paper   IPM / P / 11555
School of Physics
  Title:   Curvature Perturbations and non-Gaussianities from Waterfall Phase Transition during Inflation
1.  A.A. Abolhasani
2.  H. Firouzjahi
3.  M.H. Namjoo
  Status:   Published
  Journal: Classical Quant. Grav.
  Vol.:  28
  Year:  2011
  Pages:   075009
  Supported by:  IPM
We consider a variant of hybrid inflation where the waterfall phase transition happens during inflation. By tuning the parameters associated with the mass of the waterfall field, we arrange that the phase transition is not sharp so inflation can proceed for an extended period after the waterfall phase transition. We show that one can work in the limit where the quantum back-reactions are subdominant compared to the classical back-reactions. It is shown that significant amount of large scale curvature perturbations are induced from the entropy perturbations. The spectral index of the curvature perturbations changes from blue to red tilt which can have interesting observational consequences on CMB. The non-Gausian parameter fNL is calculated to be <~1 but much bigger than the slow-roll parameters.

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