Garriga Torres, JaumeMarrone, Matteo Gabriel2025-09-102025-09-102025-06https://hdl.handle.net/2445/223102Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2025, Tutor: Jaume Garriga TorresA random field of cosmological perturbations may have rare high peaks which evolve non-linearly after they cross the horizon during the radiation dominated era, forming primordial black holes (PBH). Using recent results for the statistics of large initial overdensities, we will consider a family of well motivated profiles for such overdensities, determining the critical amplitude which causes them to collapse gravitationally. This is relevant for determining the abundance of PBH for a given primordial power spectrum of cosmological perturbations.6 p.application/pdfengcc-by-nc-nd (c) Marrone, 2025http://creativecommons.org/licenses/by-nc-nd/3.0/es/CosmologiaCol·lapse gravitacionalTreballs de fi de grauCosmologyGravitational collapseBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess