Primordial black hole constraints for curvaton models with predicted large non-Gaussianity

Abstract

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 ${\mathcal{P}}_{\zeta }\lesssim 10^{-2}$. We give examples of PBH mass spectra calculations and PBH constraints for the particular case of the curvaton model.

The manuscript has some intersections with arxiv:1210.3262 but contains new ingredients and more precise conclusions; title is changed appropriately. Includes 13 pages, 4 figures. Accepted for publication in Int. J. Mod. Phys. D

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