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Paper   IPM / P / 12059
School of Physics
  Title:   Curvature Perturbation and Waterfall Dynamics in Hybrid Inflation
  Author(s): 
1.  A. A. Abolhasani
2.  H. Firouzjahi
3.  M. Sasaki
  Status:   Published
  Journal: JCAP
  Vol.:  10
  Year:  2011
  Pages:   015
  Supported by:  IPM
  Abstract:
We investigate the parameter spaces of hybrid inflation model with special attention paid to the dynamics of waterfall field and curvature perturbations induced from its quantum fluctuations. Depending on the inflaton field value at the time of phase transition and the sharpness of the phase transition inflation can have multiple extended stages. We find that for models with mild phase transition the induced curvature perturbation from the waterfall field is too large to satisfy the COBE normalization. We investigate the model parameter space where the curvature perturbations from the waterfall quantum fluctuations vary between the results of standard hybrid inflation and the results obtained here.

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