Primordial black holes as all dark matter

We argue that a primordial black hole is a natural and unique candidate for all dark matter. We show that, in a smooth-hybrid new double inflation model, a right amount of the primordial black holes, with a sharply-defined mass, can be produced at the end of the smooth-hybrid regime, through preheating. We first consider masses < 10-7M which are allowed by all the previous constraints. We next discuss much heavier mass 105M hinted at by entropy, and galactic size evolution, arguments. Effects on the running of the scalar spectral index are computed. Keywords->