The role of primordial black holes as cosmological seeds

Primordial Black Holes (PBH) represent a unique avenue for understanding the early Universe and its contribution to the formation of Large Scale Structures. This thesis focuses on the theory of Large Scale Structure formation using the tools provided by the Excursion Set Theory. The James Webb Space Telescope (JWST) observations found several excessively massive galaxies at high redshifts (z ∼ 10) that cannot be explained by the ΛCDM model. We first explore the impact of PBH clustering, revealing that clustering effects are not significant within the scope of our analysis. By introducing PBHs as the seeds of Large Scale Structures, this work investigates the deviations ob- served. The study focuses on the accretion process starting from an initial PBH with mass of about 10^10M⊙.