Protecting the primordial baryon asymmetry in the seesaw model compatible with WMAP and KamLAND

2003/09/26 by K. Hasegawa
Mathematics · Physics and Astronomy · #Anisotropy #Asymmetry #Baryon #Baryon asymmetry #CMB cold spot #Cosmic microwave background #Dark Matter and Cosmic Phenomena #Lepton #Mathematics #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Seesaw mechanism #Seesaw molecular geometry #Symmetry (geometry) #astro-ph #hep-ph

paper · pdf · doi:10.1103/physrevd.69.013002

published as Phys.Rev. D69 (2004) 013002 · 21pages; added references

arxiv created 2003/09/26 · openalex publication_date 2004/01/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We require that the primordial baryon asymmetry is not washed out in the seesaw model compatible with the recent results of WMAP and the neutrino oscillation experiments including the first results of KamLAND. We find that only the case of the normal neutrino mass hierarchy with an approximate L_e symmetry satisfies this requirement. We further derive, depending on the signs of the neutrino mass eigenvalues, three types of the neutrino mass matrices, where the values of each element are rather precisely fixed.

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