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Minimum mass for primordial black holes

Physics Asked by John O on February 8, 2021

I’m seeing two values for the minimum mass of primordial black holes.
$10^{-5}$ g (see 1974 paper by Carr and Hawking) and 1g (see 2004 paper by Carr).

Which is correct, if either?

1974
Carr,B.J., Hawking,S.W.,
Black holes in the early Universe
http://articles.adsabs.harvard.edu/pdf/1974MNRAS.168..399C

"There could thus be primordial black holes around now with masses from $10^{-5}$ g upwards."

2004
B. J. Carr, Primordial Black Holes – Recent Developments
https://www.slac.stanford.edu/econf/C041213/papers/0204.PDF

"PBHs formed before the end of inflation will be diluted to a negligible density. Inflation thus imposes a lower limit on the PBH mass spectrum… Mmin certainly exceeds 1 g."

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