Hunting Dark Matter with the Einstein Telescope

TL;DR

This paper explores how clustered primordial black holes could form dark matter and produce a detectable gravitational wave background for the Einstein Telescope.

Contribution

It proposes a scenario where clustered black holes lead to heavier black hole formation and a unique gravitational wave signature.

Findings

Clustered primordial black holes can form heavier black holes.

Such black holes could account for all dark matter.

A flat stochastic gravitational wave background is predicted.

Abstract

Too light primordial black holes evaporate and are therefore strongly constrained by various bounds, e.g. Cosmic Microwave Background distortion. However, if they are formed strongly clustered, the corresponding haloes may collapse in heavier black holes which may form the entirety of the dark matter of the universe. The indirect signal of such scenario is the production of a flat stochastic background of gravitational waves which is detectable by the Einstein Telescope.