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CP-violation in Supernova Neutrino Oscillations
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Fysik. Linköpings universitet, Tekniska högskolan.
2014 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)Alternativ titel
CP-brott i Supernovaneutrinooscillationer (Svenska)
Abstract [en]

It is astonishing both how little and how much we know about neutrinos. On one hand, the neutrino is the second most abundant particle in our Universe. Neutrinos may be created in the Sun, core collapse supernovae, cosmic rays, geological background radiation, supernova remnants and in the Big Bang. On the other hand, they have unimaginably small masses and are unwilling to react with their surroundings. Because of their abundance and their inclination to show us physics beyond the standard model of particle physics, neutrinos are hoped to carry yet unknown information of the Universe. However, it will take some effort and time to persuade the neutrinos to tell us what they know.

Among the things we do not yet know of the neutrinos, is the -phase in the neutrino mixing matrix. If is in fact non-zero, neutrino flavour oscillations violate CP-symmetry. Also, if neutrino masses are introduced in the standard model through the See-Saw mechanism and if leptogenesis is a valid theory, CP-violation in neutrino oscillations could help explain why our Universe has no antimatter even though equal amounts of matter and antimatter should have been created at the Big Bang.

In this thesis, we investigate the flavour evolution of supernova neutrinos. We present the full Hamiltonian in the flavour basis for our system and identify how the different contributions affect the evolution and in which environment. We also present a theoretical motivation from [1, 2] as to how a non-zero -phase affects the flavour evolution and the final energy spectra. The analytical conclusion is that it has no impact under the assumptions made in our analysis. Thus, the -phase may not be measurable from supernova neutrinos.

Ort, förlag, år, upplaga, sidor
2014. , s. 54
Nyckelord [en]
CP-violation, δ-phase, neutrino oscillation, three-flavour, supernova
Nationell ämneskategori
Subatomär fysik
Identifikatorer
URN: urn:nbn:se:liu:diva-109922ISRN: LITH-IFM-A-EX--14/2962--SEOAI: oai:DiVA.org:liu-109922DiVA, id: diva2:741647
Externt samarbete
Kungliga Tekniska Högskolan
Ämne / kurs
Fysik
Tillgänglig från: 2014-08-29 Skapad: 2014-08-28 Senast uppdaterad: 2014-08-29Bibliografiskt granskad

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