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Paper   IPM / Astronomy / 13909
School of Astronomy
  Title:   Effective Field Theory of non-Attractor Inflation
  Author(s): 
1.  M. Akhshik
2.  H. Firouzjahi
3.  S. Jazayeri
  Status:   Published
  Journal: JCAP
  Year:  2015
  Supported by:            ipm IPM
  Abstract:
We present the model-independent studies of non attractor inflation in the context of effective field theory (EFT) of inflation. Within the EFT approach two independent branches of non-attractor inflation solutions are discovered in which a near scale-invariant curvature perturbation power spectrum is generated from the interplay between the variation of sound speed and the second slow roll parameter . The first branch captures and extends the previously studied models of non-attractor inflation in which the curvature perturbation is not frozen on super-horizon scales and the single field non-Gaussianity consistency condition is violated. We present the general expression for the amplitude of local-type non-Gaussianity in this branch. The second branch is new in which the curvature perturbation is frozen on super-horizon scales and the single field non-Gaussianity consistency condition does hold in the squeezed limit. Depending on the model parameters, the shape of bispectrum in this branch changes from an equilateral configuration to a folded configuration while the amplitude of non-Gaussianity is less than unity.

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