Production of Primordial Black Holes via Single Field Inflation and Observational Constraints

TL;DR

This paper explores how single field inflation models can produce primordial black holes across a wide mass range, potentially accounting for dark matter, and discusses observational constraints on these models.

Contribution

It demonstrates that specific single field inflation models can generate primordial black holes over a broad mass spectrum, linking them to dark matter.

Findings

PBHs formed in models range from 10^{-18} to 10^{-6} solar masses

Dark matter density can be explained by PBHs in certain models

Model parameters influence PBH mass and abundance

Abstract

In a class of single field models of inflation, the idea of Primordial Black holes(PBHs) production is studied. In this case, the dynamics on small cosmological scales differs significantly from that of the large scales probed by the observations of cosmic microwave background(CMB). This difference becomes a virtue in producing correct physical ambiance for the seeds required to produce PBHs. Thus, once the perturbed scales renter the horizon of our Universe during the later epochs of radiation domination and subsequent matter domination, these seeds collapses to produce PBHs. We have shown, in this class of model, depending on the model parameters and the class defining set parameters, one can have PBHs formed for a vast mass ranges from $10^{-18}$ to $10^{-6}$ solar mass(\(\textup{M}_\odot\)). We have also shown, for a particular class of model, the total dark matter density today can be attributed to the PBHs density. The vast range of the mass depending on the class parameter, gives ample opportunity to study enriched phenomenological implications associated with this model to probe the nascent Universe dynamics.