Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-18
Phys.Rev.D69:083506,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, no figure, the version accepted to Phys. Rev. D; a few explanatory comments are added
Scientific paper
10.1103/PhysRevD.69.083506
We discuss a spontaneous baryogenesis mechanism in flat directions. After identifying the Nambu-Goldstone mode which derivatively couples to the associated $U$(1) current and rotates due to the A-term, we show that spontaneous baryogenesis can be naturally realized in the context of the flat direction. As applications, we discuss two scenarios of baryogenesis in detail. One is baryogenesis in a flat direction with a vanishing $B-L$ charge, especially, with neither baryon nor lepton charge, which was recently proposed by Chiba and the present authors. The other is a baryogenesis scenario compatible with a large lepton asymmetry.
Takahashi Fuminobu
Yamaguchi Masahide
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