Sarikas, Srdjan (2011) Neutrino oscillations at high densities: cosmological and astrophysical aspects. [Tesi di dottorato] (Inedito)

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Tipologia del documento:	Tesi di dottorato
Lingua:	English
Titolo:	Neutrino oscillations at high densities: cosmological and astrophysical aspects
Autori:	Autore Email Sarikas, Srdjan sarikas@na.infn.it
Data:	2011
Numero di pagine:	105
Istituzione:	Università degli Studi di Napoli Federico II
Dipartimento:	Scienze fisiche
Scuola di dottorato:	Scienze fisiche
Dottorato:	Fisica fondamentale ed applicata
Ciclo di dottorato:	24
Coordinatore del Corso di dottorato:	nome email Velotta, Raffaele velotta@na.infn.it
Tutor:	nome email Miele, Gennaro miele@na.infn.it Mangano, Gianpiero mangano@na.infn.it
Data:	2011
Numero di pagine:	105
Parole chiave:	neutrinos, big bang nucleosynthesis, neutrino:supernova, neutrino:asymmetry, neutrino:oscillations, lepton number, physics of the early universe, primordial asymmetries, MSW effect, neutrino:mass hierarchy, stability analysis
Settori scientifico-disciplinari del MIUR:	Area 02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici Area 02 - Scienze fisiche > FIS/04 - Fisica nucleare e subnucleare Area 02 - Scienze fisiche > FIS/05 - Astronomia e astrofisica
Depositato il:	05 Dic 2011 11:25
Ultima modifica:	30 Apr 2014 19:47
URI:	http://www.fedoa.unina.it/id/eprint/8573
DOI:	10.6092/UNINA/FEDOA/8573

Abstract

This doctoral thesis treats the effects of neutrino oscillations in the early universe and supernovae. The main probe for the context of the early universe is big bang nucleosynthesis (BBN). I explain the general link between neutrinos and BBN with an emphasis on the degeneracy between neutrino asymmetry and extra degrees of freedom. I show how the degenerate effects of both oscillations and collisions lead to observables detectable in the near future that brake this degeneracy and draw bounds on neutrino asymmetry and their contribution to the energy density of the universe in the current epoch. Considering astrophysical aspects, I analyze the significance of a proper treatment of neutrino evolution to understand the neutrino signal from the next galactic supernova (SN). I show the type of effects collective neutrino conversions can produce and the numerical difficulties confronted. Finally, I show how that stability analysis can complement a numerical treatment and provide definitive answers in some example cases.

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