Primordial black holes, a small review

TL;DR

This review discusses primordial black holes, their origins, characteristics, current constraints, and their potential role as dark matter candidates, highlighting their significance in probing new physics and quantum gravity.

Contribution

It provides a comprehensive overview of primordial black holes, summarizing recent research, constraints, and their importance in cosmology and fundamental physics.

Findings

Primordial black holes could account for some or all dark matter.

Current observational constraints limit the abundance of primordial black holes.

Black holes may serve as portals to new physics and quantum gravity.

Abstract

With the direct discovery of gravitational waves, black holes have regain interest in the recent years. In particular primordial black holes (PBHs), which originate from the very early Universe, may constitute (at least in part) dark matter. The possibility that dark matter is made of black holes is particularly appealing, and multi-messenger searches are important to probe this hypothesis. In this paper I will discuss the concept of primordial black holes, their origins, their characteristics and the current constraints. In addition I will explain that the study of black holes is of utmost interest since they may constitute portals to new physics and to quantum gravity.