Primordial Black Hole Generation in a Two-field Inflationary Model

TL;DR

This paper investigates how sharp turns in the trajectory of two-field inflation models can lead to the formation of primordial black holes, highlighting specific solution classes that facilitate this process.

Contribution

It demonstrates that sharp turns in the background trajectory during two-field inflation can produce primordial black holes, introducing new solution classes with ultra-slow to slow roll transitions.

Findings

Sharp turns in field space can generate primordial black holes.

Certain solutions exhibit transitions from ultra-slow to slow roll.

The model identifies conditions for black hole formation during inflation.

Abstract

We summarize our work on the generation of primordial black holes in a type of two-field inflationary models. The key ingredient is a sharp turn of the background trajectory in field space. We show that certain classes of solutions to the equations of motion exhibit precisely this kind of behavior. Among them we find solutions, which describe a transition between an ultra-slow roll and a slow roll phases of inflation.