The main goal of this paper is to derive the primordial power spectrum for
the scalar perturbations generated as a result of quantum fluctuations during
an inflationary pe- riod by an alternative approach of field quantization[1-3].
Formulas are derived for the gravitational waves, special cases of which
include power law inflation and inflation in the slow roll approximation, in
Krein space quantization.Comment: 6 pages, published in MPL
