Inflation in the Early Universe is the standard paradigm for explaining the generation of the first density perturbations from which all the structures we observe in the Universe formed by subsequent gravitational instability. Inflation also predicts the production of a stochastic background of gravitational waves. For most of the purposes in this context a perturbative approach to study the generation of cosmological perturbations is enough. There are however some aspects for which deviations from a simple perturbative approach might be relevant (such as the study of the onset of Inflation, or the possibility to form primordial black holes from Inflation). The Thesis will overview a novel non-perturbative approach to primordial cosmological perturbations, with a focus on the possible consequences for primordial gravitational waves and primordial scalar perturbations, and will investigate the interplay between such non-perturbative technique and the generation of primordial black holes.

Inflation in the Early Universe is the standard paradigm for explaining the generation of the first density perturbations from which all the structures we observe in the Universe formed by subsequent gravitational instability. Inflation also predicts the production of a stochastic background of gravitational waves. For most of the purposes in this context a perturbative approach to study the generation of cosmological perturbations is enough. There are however some aspects for which deviations from a simple perturbative approach might be relevant (such as the study of the onset of Inflation, or the possibility to form primordial black holes from Inflation). The Thesis will overview a novel non-perturbative approach to primordial cosmological perturbations, with a focus on the possible consequences for primordial gravitational waves and primordial scalar perturbations, and will investigate the interplay between such non-perturbative technique and the generation of primordial black holes.

A non-perturbative approach to cosmological perturbations

IMPAVIDO, RICCARDO
2022/2023

Abstract

Inflation in the Early Universe is the standard paradigm for explaining the generation of the first density perturbations from which all the structures we observe in the Universe formed by subsequent gravitational instability. Inflation also predicts the production of a stochastic background of gravitational waves. For most of the purposes in this context a perturbative approach to study the generation of cosmological perturbations is enough. There are however some aspects for which deviations from a simple perturbative approach might be relevant (such as the study of the onset of Inflation, or the possibility to form primordial black holes from Inflation). The Thesis will overview a novel non-perturbative approach to primordial cosmological perturbations, with a focus on the possible consequences for primordial gravitational waves and primordial scalar perturbations, and will investigate the interplay between such non-perturbative technique and the generation of primordial black holes.
2022
A non-perturbative approach to cosmological perturbations
Inflation in the Early Universe is the standard paradigm for explaining the generation of the first density perturbations from which all the structures we observe in the Universe formed by subsequent gravitational instability. Inflation also predicts the production of a stochastic background of gravitational waves. For most of the purposes in this context a perturbative approach to study the generation of cosmological perturbations is enough. There are however some aspects for which deviations from a simple perturbative approach might be relevant (such as the study of the onset of Inflation, or the possibility to form primordial black holes from Inflation). The Thesis will overview a novel non-perturbative approach to primordial cosmological perturbations, with a focus on the possible consequences for primordial gravitational waves and primordial scalar perturbations, and will investigate the interplay between such non-perturbative technique and the generation of primordial black holes.
cosmology
quantum field theory
inflation
non perturbative
de Sitter, quas
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12608/45504