Neutrinos in Astrophysics and Cosmology - INFN Sezione di Ferrara
Neutrinos in Astrophysics and Cosmology - INFN Sezione di Ferrara
Neutrinos in Astrophysics and Cosmology - INFN Sezione di Ferrara
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Leptogenesis by Majorana Neutr<strong>in</strong>o Decays<br />
In see-saw see saw models for neutr<strong>in</strong>o masses, out-of out of-equilibrium<br />
equilibrium<br />
decays of right-h<strong>and</strong>ed right h<strong>and</strong>ed heavy Majorana neutr<strong>in</strong>os provide<br />
source for CP- CP <strong>and</strong> L-violation L violation<br />
Cosmological evolution<br />
• B = L = 0 early on<br />
• Thermal freeze-out freeze out of heavy Majorana neutr<strong>in</strong>os<br />
• Out-of Out of-equilibrium equilibrium CP-violat<strong>in</strong>g CP violat<strong>in</strong>g decay creates net L<br />
• Shift L excess <strong>in</strong>to B by sphaleron effects<br />
Sufficient deviation from<br />
equilibrium <strong>di</strong>stribution of<br />
heavy Majorana neutr<strong>in</strong>os<br />
at freeze-out freeze out<br />
Limits on<br />
Yukawa<br />
coupl<strong>in</strong>gs<br />
Requires Majorana neutr<strong>in</strong>o masses below 0.1 eV<br />
Buchmüller, Buchm ller, Di Bari & Plümacher Pl macher, , hep-ph hep ph/0209301 /0209301 & hep-ph hep ph/0302092 /0302092<br />
Limits on<br />
masses of<br />
ord<strong>in</strong>ary<br />
neutr<strong>in</strong>os<br />
Georg Raffelt, Max-Planck-Institut für Physik, München, Germany IDAPP 2d Meet<strong>in</strong>g, 12-13 May 2006, <strong>Ferrara</strong>, Italy
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