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Triplet leptogenesis in left-right symmetric seesaw models
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
2008 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, Vol. 2008, no 01, 014- p.Article in journal (Refereed) Published
Abstract [en]

We discuss scalar triplet leptogenesis in a specific left-right symmetric seesaw model. We show that the Majorana phases that are present in the model can be effectively used to saturate the existing upper limit on the CP-asymmetry of the triplets. We solve the relevant Boltzmann equations and analyze the viability of triplet leptogenesis. It is known for this kind of scenario that the efficiency of leptogenesis is maximal if there exists a hierarchy between the branching ratios of the triplet decays into leptons and Higgs particles. We show that triplet leptogenesis typically favors branching ratios with not too strong hierarchies, since maximal efficiency can only be obtained at the expense of suppressed CP-asymmetries.

Place, publisher, year, edition, pages
IOP Publishing / SISSA , 2008. Vol. 2008, no 01, 014- p.
Keyword [en]
Baryon asymmetry; Cosmology of theories beyond the SM; Neutrino properties
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-7442DOI: 10.1088/1475-7516/2008/01/014ISI: 000252932200018ScopusID: 2-s2.0-38949145112OAI: diva2:12469
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2005-3588
QC 20100716. Uppdaterad från manuskript till artikel 20100716.Available from: 2011-06-21 Created: 2007-09-03 Last updated: 2011-06-21Bibliographically approved
In thesis
1. 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.
Trita-FYS, ISSN 0280-316X ; 2007:48
Dimensional deconstruction, higher-dimensional gauge theories, discretized gravity, neutrino mass, neutrino mixing, neutrino oscillations
National Category
Other Engineering and Technologies
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)
QC 20100716Available from: 2007-09-03 Created: 2007-09-03 Last updated: 2010-07-16Bibliographically approved

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