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Effective neutrino mixing and oscillations in dense matter
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0001-5948-9152
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
2005 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 609, no 3-4, 330-338 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the effective case of two-flavor neutrino oscillations in infinitely dense matter by using a perturbative approach. We begin by briefly summarizing the conditions for the three-flavor neutrino oscillation probabilities to take on the same form as the corresponding two-flavor probabilities. Then, we proceed with the infinitely dense matter calculations. Finally, we study the validity of the approximation of infinitely dense matter when the effective matter potential is large, but not infinite, this is done by using both analytic and numeric methods.

Place, publisher, year, edition, pages
Elsevier B.V. , 2005. Vol. 609, no 3-4, 330-338 p.
Keyword [en]
analytic method; article; calculation; mathematical computing; mathematical model; neutrino; oscillation; probability; validation process
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-7246DOI: 10.1016/j.physletb.2005.01.063ISI: 000227534200022ScopusID: 2-s2.0-14144254930OAI: oai:DiVA.org:kth-7246DiVA: diva2:12201
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Note

QC 20100630

Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2012-10-01Bibliographically 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. Matter and damping effects in neutrino mixing and oscillations
Open this publication in new window or tab >>Matter and damping effects in neutrino mixing and oscillations
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis is devoted to the study of neutrino physics in general and the study of neutrino mixing and oscillations in particular. In the standard model of particle physics, neutrinos are massless, and as a result, they do not mix or oscillate. However, many experimental results now seem to give evidence for neutrino oscillations, and thus, the standard model has to be extended in order to incorporate neutrino masses and mixing among different neutrino flavors.

When neutrinos propagate through matter, the neutrino mixing, and thus, also the neutrino oscillations, may be significantly altered. While the matter effects may be easily studied in a framework with only two neutrino flavors and constant matter density, we know that there exists (at least) three neutrino flavors and that the matter density of the Universe is far from constant. This thesis includes studies of three-flavor effects and a solution to the two-flavor neutrino oscillation problem in matter with an arbitrary density profile.

Furthermore, there have historically been attempts to describe the neutrino flavor transitions by other effects than neutrino oscillations. Even if these effects now seem to be disfavored as the leading mechanism, they may still give small corrections to the neutrino oscillation formulas. These effects may lead to erroneous determination of the fundamental neutrino oscillation parameters and are also studied in this thesis in form of damping factors.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. x, 57 p.
Series
Trita-FYS, ISSN 0280-316X ; 2005:21
Keyword
Engineering physics, Neutrino oscillations, neutrino mixing, matter effects, damping effects, the day-night effect, solar neutrinos, Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-301 (URN)91-7178-016-5 (ISBN)
Supervisors
Note
QC 20101124Available from: 2005-07-15 Created: 2005-07-15 Last updated: 2011-12-09Bibliographically approved

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