Spectral index and its running with deviation from the “slow-roll”

Abstract

A deviation from the slow roll may shift the spectral index and its running. Such a deviation is very generic in inflationary models since the slow-roll equation is not the exact solution of the field equation. We calculate the spectral index and its running with non-vanishing deviation parameter, showing that the deviation parameter is a “hidden” parameter of the standard calculation. A running spectral index scenario in which the spectral index runs from blue (n > 1) on large length scales to red (n < 1) on short length scales is examined.

Cite this paper

@inproceedings{Matsuda2007SpectralIA, title={Spectral index and its running with deviation from the “slow-roll”}, author={Tomohiro Matsuda}, year={2007} }