Bounds on the cosmological abundance of primordial black holes from diffuse sky brightness: Single mass spectra

Evidence for the primordial black holes (PBH) presence in the early Universe renews permanently. New limits on their mass spectrum challenge existing models of PBH formation. One of the known models is based on the closed walls collapse after the inflationary epoch. Its intrinsic feature is the multiple production of small mass PBH which might contradict observations in the nearest future. We show that the mechanism of walls collapse can be applied to produce substantially different PBH mass spectra if one takes into account the classical motion of scalar fields together with their quantum fluctuations at the inflationary stage. Analytical formulas have been developed that contain both quantum and classical contributions.

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PRIMORDIAL BLACK HOLE CONSTRAINTS FOR CURVATON MODELS WITH PREDICTED LARGE NON-GAUSSIANITY

International Journal of Modern Physics D ◽

10.1142/s021827181350034x ◽

2013 ◽

Vol 22 (07) ◽

pp. 1350034 ◽

Cited By ~ 22

Author(s):

E. V. BUGAEV ◽

P. A. KLIMAI

Keyword(s):

Black Holes ◽

Black Hole ◽

Power Spectrum ◽

Mass Spectra ◽

Primordial Black Hole ◽

Primordial Black Holes ◽

Curvature Perturbation ◽

Small Scales ◽

Non Gaussian ◽

Spectrum Amplitude

We consider the early Universe scenario which allows for production of non-Gaussian curvature perturbations at small scales. We study the peculiarities of a formation of primordial black holes (PBHs) connected with the non-Gaussianity. In particular, we show that PBH constraints on the values of curvature perturbation power spectrum amplitude are strongly dependent on the shape of perturbations and can significantly (by two orders of magnitude) deviate from the usual Gaussian limit [Formula: see text]. We give examples of PBH mass spectra calculations and PBH constraints for the particular case of the curvaton model.

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Reionization effect enhancement due to primordial black holes

International Journal of Modern Physics D ◽

10.1142/s0218271817501024 ◽

2017 ◽

Vol 26 (09) ◽

pp. 1750102 ◽

Cited By ~ 9

Author(s):

K. M. Belotsky ◽

A. A. Kirillov ◽

N. O. Nazarova ◽

S. G. Rubin

Keyword(s):

Black Holes ◽

Dark Matter ◽

Mass Distribution ◽

Mass Spectra ◽

Mass Range ◽

Specific Model ◽

Primordial Black Holes ◽

Wide Range ◽

G Value ◽

The Universe

Primordial black holes (PBHs) could account for variety of phenomena like dark matter, reionization of the universe, early quasars, coalescence of black holes registered through gravitational waves recently. Each phenomenon relates to PBH of a specific mass range. PBH mass spectra varies in a wide range depending on specific model. Earlier, we have shown that PBH with monochromatic mass distribution around [Formula: see text] g value allow to re-ionize the universe moderately. Here, we show that reionization effect and contribution to dark matter can be simultaneously enhanced with more natural extended mass distribution in the range around the same mass value.

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