Blue spectra and induced formation of primordial black holes

Details Blue spectra and induced formation of primordial black holes Blue spectra and induced formation of primordial black holes

1998-06-10

arxiv.org/abs/astro-ph/9806139v1

Phys.Rev. D58 (1998) 103517

Astronomy and Astrophysics

Astrophysics

16 pages, 2 figures

Scientific paper

10.1103/PhysRevD.58.103517

We investigate the statistical properties of primordial black hole (PBH) formation in the very early Universe. We show that the high level of inhomogeneity of the early Universe leads to the formation of the first generation PBHs. %The existence of these PBHs This causes later the appearance of a dust-like phase of the cosmological expansion. We discuss here a new mechanism for the second generation of PBH formation during the dust-like phase. This mechanism is based on the coagulation process. We demonstrate that the blue power spectrum of initial adiabatic perturbations after inflation leads to overproduction of primordial black holes with $10^9$g$\le M\le10^{15}$g if the power index is $n\ge1.2$.

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