# Ultracompact minihalos associated with stellar-mass primordial black holes

## TL;DR

This paper explores the formation of ultracompact dark matter minihalos associated with stellar-mass primordial black holes, highlighting their potential detectability through future pulsar observations and their dependence on primordial non-Gaussianity.

## Contribution

It introduces the concept that dark matter minihalos formed alongside primordial black holes could be abundant and detectable, depending on early Universe conditions.

## Key findings

- Minihalos formed in the early Universe are likely very compact.
- Their formation depends on primordial non-Gaussianity.
- Potential detection via future pulsar observations.

## Abstract

The possibility that primordial black hole binary mergers of stellar mass can explain the signals detected by the gravitational-wave interferometers has attracted much attention. In this scenario, primordial black holes can comprise only part of the entire dark matter, say, of order 0.1 %. This implies that most of the dark matter is accounted for by a different component, such as Weakly Interacting Massive Particles. We point out that in this situation, very compact dark matter minihalos, composed of the dominant component of the dark matter, are likely to be formed abundantly in the early Universe, with their formation redshift and abundance depending on primordial non-Gaussianity. They may be detected in future experiments via pulsar observations.