Bounds on Generic High-energy Physics Modifications to the Primordial Power Spectrum from Back-reaction on the Metric

@inproceedings{Porrati2004BoundsOG,
  title={Bounds on Generic High-energy Physics Modifications to the Primordial Power Spectrum from Back-reaction on the Metric},
  author={Massimo Porrati},
  year={2004}
}
Modifications to the primordial power spectrum of inflationary density perturbations have been studied recently using a boundary effective field theory approach. In the approximation of a fluctuating quantum field on a fixed background, the generic effect of new physics is encoded in parameters of order H/M. Here, we point out that the back-reaction on the metric can be neglected only when these parameters obey certain bounds that may put them beyond the reach of observation. 

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