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We discuss the hypothesis that a large (or even a major) fraction of dark matter in the Universe consists of primordial black holes (PBH's). PBH's may arise from adiabatic quantum fluctuations appearing during inflation. We demonstrate that the inflation potential V (cphi) leading to the formation of a great number of PBH's should have a feature of the ``plateau''-type in some range cphi₁cphicphi₂ of the inflation field cphi. The mass spectrum of PBH's for such a potential is calculated.
Ivanov et al. (Thu,) studied this question.
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