Formation of primordial black holes in an axionlike curvaton model

Abstract

We perform the detailed analysis of the primordial black hole (PBH) formation mechanism in an axionlike curvaton model with a coupling to inflaton. The phase direction of the complex scalar works as a curvaton and produces enough PBHs to explain the black hole binaries ($\ensuremath{\sim}30\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$) observed in the LIGO-Virgo Collaboration or PBHs as dark matter ($\ensuremath{\sim}{10}^{\ensuremath{-}12}\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$). We examine whether our model satisfies the current constraints on the PBH mass spectrum, the curvature perturbation, and the secondarily produced gravitational waves. We also take into account ambiguity about the choice of the window functions and effect of the non-Gaussianity.