# Primordial black holes as dark matter and generators of cosmic structure

## TL;DR

This paper explores the potential of primordial black holes across various mass ranges to account for dark matter and influence cosmic structure formation, especially in light of recent black-hole merger detections.

## Contribution

It analyzes constraints on PBH masses and discusses their roles in dark matter composition and structure formation, highlighting new cosmological implications of massive PBHs.

## Key findings

- PBHs in specific mass windows could constitute dark matter.
- Massive PBHs may seed or cluster to form cosmic structures.
- PBHs larger than 10^3 solar masses have significant cosmological effects.

## Abstract

Primordial black holes (PBHs) could provide the dark matter but a variety of constraints restrict the possible mass windows to $10^{16} - 10^{17}$g, $10^{20} - 10^{24}$g and $10 - 10^3M_{\odot}$. The last possibility is of special interest in view of the recent detection of black-hole mergers by LIGO. PBHs larger than $10^3 M_{\odot}$ might have important cosmological consequences even if they have only a small fraction of the dark matter density. In particular, they could generate cosmological structures either individually through the "seed" effect or collectively through the "Poisson" effect, thereby alleviating some problems associated with the standard cold dark matter scenario.