Near-Critical Gravitational Collapse and the Initial Mass Function of Primordial Black Holes

  title={Near-Critical Gravitational Collapse and the Initial Mass Function of Primordial Black Holes},
  author={Jens C. Niemeyer and Karsten Jedamzik},
  journal={Physical Review Letters},
The recent discovery of critical phenomena arising in gravitational collapse near the threshold of black-hole formation is used to estimate the initial mass function of primordial black holes (PBHs). It is argued that the scaling relation between black-hole mass and initial perturbation found for a collapsing radiation fluid in an asymptotically flat space-time also applies to PBH formation in a Friedmann universe. Owing to the natural fine tuning of initial conditions by the exponential… 
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