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Paper   IPM / Astronomy / 12879
School of Astronomy
  Title:   Modulated curvaton decay
1.  H. Assadullahi
2.  H. Firouzjahi
3.  M H. Namjoo
4.  D. Wands
  Status:   Published
  Journal: JCAP
  Year:  2013
  Pages:   041
  Supported by:            ipm IPM
We study primordial density perturbations generated by the late decay of a curvaton field whose decay rate may be modulated by the local value of another isocurvature field, analogous to models of modulated reheating at the end of inflation. We calculate the primordial density perturbation and its local-type non-Gaussianity using the sudden-decay approximation for the curvaton field, recovering standard curvaton and modulated reheating results as limiting cases. We verify the Suyama-Yamaguchi inequality between bispectrum and trispectrum parameters for the primordial density field generated by multiple field fluctuations, and find conditions for the bound to be saturated.

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