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Stability and leptogenesis in the left-right symmetric seesaw mechanism
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik.
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik.ORCID-id: 0000-0001-5948-9152
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik.
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik.
Vise andre og tillknytning
2007 (engelsk)Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 4, s. 022-1-022-25Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We analyze the left-right symmetric type I+II seesaw mechanism, where an eight-fold degeneracy among the mass matrices of heavy right-handed neutrinos M-R is known to exist. Using the stability property of the solutions and their ability to lead to successful baryogenesis via leptogenesis as additional criteria, we discriminate among these eight solutions and partially lift their eight-fold degeneracy. In particular, we find that viable leptogenesis is generically possible for four out of the eight solutions.

sted, utgiver, år, opplag, sider
2007. Vol. 4, s. 022-1-022-25
Emneord [en]
baryogenesis, neutrino physics
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-7250DOI: 10.1088/1126-6708/2007/04/022ISI: 000246396400022OAI: oai:DiVA.org:kth-7250DiVA, id: diva2:12205
Merknad
QC 20100630 QC 20110518Tilgjengelig fra: 2011-05-18 Laget: 2007-05-31 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Theoretical and Phenomenological Studies of Neutrino Physics
Åpne denne publikasjonen i ny fane eller vindu >>Theoretical and Phenomenological Studies of Neutrino Physics
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis is devoted to the theory and phenomenology of neutrino physics. While the standard model of particle physics has been extremely successful, it fails to account for massive neutrinos, which are necessary to describe the observations of neutrino oscillations made by several different experiments. Thus, neutrino physics is a possible window for exploring the physics beyond the standard model, making it both interesting and important for our fundamental understanding of Nature.

Throughout this thesis, we will discuss different aspects of neutrino physics, ranging from taking all three types of neutrinos into account in neutrino oscillation experiments to exploring the possibilities of neutrino mass models to produce a viable source of the baryon asymmetry of the Universe. The emphasis of the thesis is on neutrino oscillations which, given their implication of neutrino masses, is a phenomenon where other results that are not describable in the standard model could be found, such as new interactions between neutrinos and fermions.

sted, utgiver, år, opplag, sider
Stockholm: Teoretisk fysik, 2007. s. xii, 102, [7]
Serie
Trita-FYS, ISSN 0280-316X ; 2007:31
Emneord
neutrino mass, neutrino mixing, neutrino oscillations, matter effects, non-standard effects, the day-night effect, solar neutrinos, accelerator neutrinos, exact solutions, three-flavor effects, large density, neutrino decay, neutrino decoherence, neutrino absorption, non-standard neutrino interactions, seesaw mechanism, stability criteria, leptogenesis
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4415 (URN)978-91-7178-646-3 (ISBN)
Disputas
2007-06-11, Oskar Kleins auditorium (FR4), Huvudbyggnaden, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Veileder
Merknad
QC 20100630Tilgjengelig fra: 2007-05-31 Laget: 2007-05-31 Sist oppdatert: 2010-06-30bibliografisk kontrollert
2. Aspects of Dimensional Deconstruction and Neutrino Physics
Åpne denne publikasjonen i ny fane eller vindu >>Aspects of Dimensional Deconstruction and Neutrino Physics
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The existence of at or curved extra spatial dimensions provides new insights into several of the problems which face the Standard Model of particle physics, including the gauge hierarchy problem, the smallness of neutrino masses, and the dark matter problem. However, higher-dimensional gauge theories are not renormalizable and can only be considered as low-energy effective theories, with limited applicability. Dimensional deconstruction provides a class of manifestly gauge invariant possible ultraviolet completions of higher-dimensional gauge theories, formulated within conventional quantum eld theory. In dimensional deconstruction, the fundamental theory is a four-dimensional quantum eld theory and extra spatial dimensions are generated dynamically at low energies. In this thesis, we study di erent applications of dimensional deconstruction in the contexts of neutrino masses, mixing and oscillations, Kaluza{Klein dark matter, and e ective eld theories for discretized higher-dimensional gravity.

A different possibility to understand the smallness of neutrino masses is provided by the see-saw mechanism. This is a genuinely four-dimensional mechanism, where the light neutrino masses are induced by the addition of heavy right-handed Majorana neutrinos or by other heavy degrees of freedom, such as scalar SU(2)L triplet elds. It has the attractive feature of simultaneously providing a mechanism for generating the observed baryon asymmetry of the Universe. We study in this context a specific left-right symmetric see-saw model.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2007. s. x, 104
Serie
Trita-FYS, ISSN 0280-316X ; 2007:48
Emneord
Dimensional deconstruction, higher-dimensional gauge theories, discretized gravity, neutrino mass, neutrino mixing, neutrino oscillations
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4480 (URN)978-91-7178-728-6 (ISBN)
Disputas
2007-09-19, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100716Tilgjengelig fra: 2007-09-03 Laget: 2007-09-03 Sist oppdatert: 2010-07-16bibliografisk kontrollert

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