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Gurnari, Davide (2017) The Cosmic Microwave Background Polarization. [Laurea triennale]

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Abstract

The aim of this thesis is to provide a phenomenological introduction to the polarization of the Cosmic Microwave Background and the physic behind it. Our work is organized in the following order: in Chapter 1 we will present some fundamental concept in modern Cosmology and in Chapter 2 we will introduce the statistical formalism that we will need for description of the CMB anisotropies. A description of the CMB, its relationship with the thermal history of the Universe and its most important properties will be given in Chapter 3, along with a dissertation about the temperature anisotropies and a qualitative explanation of the origin of these fluctuations. Chapter 4 will be devoted to Thomson scattering, how it can lead to a linear polarization pattern under certain conditions and the development of a mathematical formalism to describe a general polarization state. Finally, in Chapter 5 we will focus on the polarization of the CMB, we will build intuition about the possible causes of various polarization patterns generated by a single electron and the differences between them. Another formalism will be introduced in order to describe the polarization without the need of a specific reference frame and it will be used to explain the modulation of the polarization modes over the last scattering surface. We will then understand how the detection of a B-mode in the CMB can be interpreted as the footprint of a primordial gravitational wave and so a strong proof of the theory of inflation.

Item Type:Laurea triennale
Corsi di Laurea Triennale:Scuola di Scienze > Fisica
Uncontrolled Keywords:early Universe; inflation; gravitational waves; Thomson scattering; Stokes parameters; quadrupoles; E-B modes
Codice ID:54716
Relatore:Liguori, Michele
Data della tesi:April 2017
Biblioteca:Polo di Scienze > Dip. Fisica e Astronomia "Galileo Galilei" - Biblioteca
Tipo di fruizione per il documento:on-line per i full-text
Tesi sperimentale (Si) o compilativa (No)?:No

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