Primordial black holes from multi-field inflation

Lorenzoni, Dario Libero (2022) Primordial black holes from multi-field inflation. [Laurea magistrale], Università di Bologna, Corso di Studio in Physics [LM-DM270]
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Abstract

In this master's thesis, the formation of Primordial Black Holes (PBHs) in the context of multi-field inflation is studied. In these models, the interaction of isocurvature and curvature perturbations can lead to a significant enhancement of the latter, and to the subsequent production of PBHs. Depending on their mass, these can account for a significant fraction (or, in some cases, the entirety) of the universe's Dark Matter content. After studying the theoretical framework of generic N-field inflationary models, the focus is restricted to the two-field case, for which a few concrete realisations are analysed. A numerical code (written in Wolfram Mathematica) is developed to make quantitative predictions for the main inflationary observables, notably the scalar power spectra. Parallelly, the production of PBHs due to the dynamics of 2-field inflation is examined: their mass, as well as the fraction of Dark Matter they represent, is calculated for the models considered previously.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Lorenzoni, Dario Libero
Relatore della tesi
Scuola
Corso di studio
Indirizzo
THEORETICAL PHYSICS
Ordinamento Cds
DM270
Parole chiave
inflation: model,inflaton: trajectory,multiple field,field theory: scalar,perturbation theory,perturbation: primordial,isocurvature: perturbation,perturbation: scalar,power spectrum: primordial,horizon: crossing,black hole: primordial,cosmic background radiation,numerical calculations
Data di discussione della Tesi
31 Maggio 2022
URI

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