Searching for primordial black holes with the einstein telescope impact of design and systematics, Gabriele Franciolini,~

1. Introduction

Primordial black holes (PBHs) represent a fascinating aspect of astrophysical research, attracting considerable attention due to their potential implications for cosmology and fundamental physics. The idea that black holes could have formed in the early universe, shortly after the Big Bang, offers a compelling avenue for understanding the nature of the universe and its evolution. Unlike stellar black holes, which are formed from the collapse of massive stars, primordial black holes could have formed from density fluctuations in the very early universe. These fluctuations might have occurred during phase transitions, inflation, or other processes that characterize the infancy of the cosmos. The significance of primordial black holes extends beyond their existence; they hold the key to addressing various unresolved questions in modern physics. Their properties could provide insights into dark matter, a mysterious substance that makes up a substantial fraction of the
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