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Stability and leptogenesis in the left-right symmetric seesaw mechanism
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.ORCID iD: 0000-0001-5948-9152
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
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2007 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 4, 022-1-022-25 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2007. Vol. 4, 022-1-022-25 p.
Keyword [en]
baryogenesis, neutrino physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-7250DOI: 10.1088/1126-6708/2007/04/022ISI: 000246396400022OAI: oai:DiVA.org:kth-7250DiVA: diva2:12205
Note
QC 20100630 QC 20110518Available from: 2011-05-18 Created: 2007-05-31 Last updated: 2011-06-15Bibliographically approved
In thesis
1. Theoretical and Phenomenological Studies of Neutrino Physics
Open this publication in new window or tab >>Theoretical and Phenomenological Studies of Neutrino Physics
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
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.

Place, publisher, year, edition, pages
Stockholm: Teoretisk fysik, 2007. xii, 102, [7] p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:31
Keyword
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
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4415 (URN)978-91-7178-646-3 (ISBN)
Public defence
2007-06-11, Oskar Kleins auditorium (FR4), Huvudbyggnaden, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100630Available from: 2007-05-31 Created: 2007-05-31 Last updated: 2010-06-30Bibliographically approved
2. Aspects of Dimensional Deconstruction and Neutrino Physics
Open this publication in new window or tab >>Aspects of Dimensional Deconstruction and Neutrino Physics
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
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.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. x, 104 p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:48
Keyword
Dimensional deconstruction, higher-dimensional gauge theories, discretized gravity, neutrino mass, neutrino mixing, neutrino oscillations
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-4480 (URN)978-91-7178-728-6 (ISBN)
Public defence
2007-09-19, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100716Available from: 2007-09-03 Created: 2007-09-03 Last updated: 2010-07-16Bibliographically approved

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Publisher's full texthttp://arxiv.org/abs/hep-ph/0612194

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