Axion-like particles and the 3.5 keV line in 4D string models

Guidetti, Veronica (2016) Axion-like particles and the 3.5 keV line in 4D string models. [Laurea magistrale], Università di Bologna, Corso di Studio in Fisica [LM-DM270], Documento ad accesso riservato.
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This work is focused on axions and axion like particles (ALPs) and their possible relation with the 3.55 keV photon line detected, in recent years, from galaxy clusters and other astrophysical objects. We focus on axions that come from string compactification and we study the vacuum structure of the resulting low energy 4D N=1 supergravity effective field theory. We then provide a model which might explain the 3.55 keV line through the following processes. A 7.1 keV dark matter axion decays in two light axions, which, in turn, are transformed into photons thanks to the Primakoff effect and the existence of a kinetic mixing between two U(1)s gauge symmetries belonging respectively to the hidden and the visible sector. We present two models, the first one gives an outcome inconsistent with experimental data, while the second can yield the desired result.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Guidetti, Veronica
Relatore della tesi
Corso di studio
Curriculum A: Teorico generale
Ordinamento Cds
Parole chiave
Axions string compactification supergravity 3.55 keV line
Data di discussione della Tesi
1 Aprile 2016

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