  Sufficiently light primordial black holes (PBH) could evaporate in the very
early universe and dilute the preexisting baryon asymmetry and/or the frozen
density of stable relics. The effect is especially strong in the case that PBHs
decayed if and when they dominated the cosmological energy density. The size of
the reduction is first calculated analytically under the simplifying assumption
of the delta-function mass spectrum of PBH and in instant decay approximation.
In the realistic case of exponential decay and for an extended mass spectrum of
PBH the calculations are made numerically. Resulting reduction of the frozen
number density of the supersymmetric relics opens for them a wider window to
become viable dark matter candidate.
