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Paper   IPM / Astronomy / 17015
School of Astronomy
  Title:   Multiple field ultraslow-roll inflation: Primordial black holes from straight bulk and distorted boundary
1.  Sina . Hooshangi
2.  Alireza . Talebian
3.  Mohammad Hossein . Namjoo
4.  Hassan . Firouzjahi
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  105
  Year:  2022
  Supported by:            ipm IPM
We study a model of two-field ultra-slow-roll (USR) inflation bounded by a curve in the field space. Curvature perturbations and non-Gaussianities can be enhanced both during the USR phase and from the inhomogeneities at the boundary. We employ the full non-linear δN formalism to calculate the probability distribution function (PDF) for curvature perturbation non-perturbatively and show that the non-linear effects can significantly enhance the abundance of the primordial black holes (PBHs). For large curvature perturbations, the PDF has a universal exponential tail, but for the intermediate values, the PDF -- and, therefore, the abundance of the PBHs -- depend sensitively on the geometry of the boundary.

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