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Jun'ichi Yokoyama, Formation of Primordial Black Holes in Inflationary Cosmology, Progress of Theoretical Physics Supplement, Volume 136, April 1999, Pages 338–352, https://doi.org/10.1143/PTPS.136.338
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Abstract
I present two inflationary universe models in which density fluctuations with a sharp peak on a specific scale are produced. When that scale reenters the Hubble radius in the subsequent radiation-dominated era, significant amount of primordial black holes can be produced that may be identified with massive compact halo objects with mass ∼ 0.5M⊙ observed through gravitational microlensing experiments.
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