Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations | Zendy

Kari Enqvist | Zendy; Antti Sorri | Zendy; Kimmo Kainulainen | Zendy

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Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations

Author(s) -

Kari Enqvist,

Antti Sorri,

Kimmo Kainulainen

Publication year - 2001

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2001/04/012

Subject(s) - physics , asymmetry , neutrino , amplitude , dissipative system , baryon asymmetry , parameter space , neutrino oscillation , particle physics , lepton , nucleosynthesis , universe , sterile neutrino , astrophysics , nuclear physics , stars , electron , quantum mechanics , statistics , mathematics

We consider active-sterile neutrino oscillations in the early universe in aninhomogeneous isocurvature background. We show that very small initial baryonicseed-inhomogeneities can trigger a growth of very large amplitude spatialfluctuations in lepton asymmetry. Domains of varying asymmetry are observed topersist for a long time despite dissipative effects. The space dependentasymmetry profiles give rise to MSW-resonances within the domain boundaries,enhancing dramatically the equilibration of the sterile neutrino species.According to our one-dimensional toy-model, the effect is so strong that almostthe entire parameter space where exponential growth of asymmetry occurs wouldbe ruled out by nucleosynthesis.Comment: 1+21 pages, 3 figure

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