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Paper   IPM / Physic / 15137
School of Physics
  Title:   Extended Effective Field Theory of Inflation
1.  A. Ashoorioon
2.  R. Casadio
3.  M. Cicoli
4.  Gh. Geshnizjani
5.  H. J. Kim
  Status:   Published
  Journal: JHEP
  Vol.:  1802
  Year:  2018
  Pages:   172
  Supported by:  IPM
We present a general framework where the effective field theory of single field inflation is extended by the inclusion of operators with mass dimension 3 and 4 in the unitary gauge. These higher dimensional operators introduce quartic and sextic corrections to the dispersion relation. We study the regime of validity of this extended effective field theory of inflation and the effect of these higher dimensional operators on CMB observables associated with scalar perturbations, such as the speed of sound, the amplitude of the power spectrum and the tensor-to-scalar ratio. Tensor perturbations remain instead, unaltered.

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