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We studied the possibility whether the massive primordial black holes (PBHs)surviving today can be produced in hybrid inflation. Though it is of greatinterest since such PBHs can be the candidate for dark matter or seeds of thesupermassive black holes in galaxies, there have not been quantitativelycomplete works yet because of the non-perturbative behavior around the criticalpoint of hybrid inflation. Therefore, combining the stochastic and $\delta N$formalism, we numerically calculated the curvature perturbations in anon-perturbative way and found, without any specific assumption of the types ofhybrid inflation, PBHs are rather overproduced when the waterfall phase ofhybrid inflation continues so long that the PBH scale is well enlarged and thecorresponding PBH mass becomes sizable enough.

Can massive primordial black holes be produced in mild waterfall hybrid inflation?