Power spectrum of scalar fluctuations of the metric during the formation of a scalar black hole in inflation

In this paper we use the collapse metric obtained by Carneiro and Fabris to calculate the power spectrum associated to gauge invariant fluctuations of the metric during the formation of a primordial scalar black hole at the end of inflation. We assume that local perturbations in the vacuum energy density can collapse by means of the collapse of the local inflaton field, generating a singularity as shown by Carneiro and Fabris. Employing a representative term of the series expansion of the scale factor we obtain a nearly scale invariant power spectrum for a second order approximation of the scale factor. Thus, the spectrum for scalar black holes obtained can be considered as a correction of the power spectrum of the primordial quantum fluctuations of the inflaton field. Hence, in view of the observed lack of angular correlation in the CMB at angles greater or equal than 60 degrees, we suggest that a correction arising from the formation of scalar black holes near the end of inflation to the primordial spectrum, can alleviate the problem of the reduced amplitude of such a spectrum.