title: Baryogenesis in a flat direction with neither baryon nor lepton charge.
abstract: We present a new mechanism of spontaneous baryogenesis. Usually such mechanisms require a derivative coupling between a scalar field and baryon current. In our model, the scalar field instead derivatively couples to a current associated with some global symmetry U(1)(Q). In this case, baryogenesis is still possible provided that an interaction exists, which violates the baryon and U(1)(Q) symmetries simultaneously. As a concrete example, we discuss baryogenesis in a flat direction with neither baryon nor lepton charge.
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Chiba
authors.forename: Fuminobu
authors.initials: F
authors.lastname: Takahashi
authors.forename: Masahide
authors.initials: M
authors.lastname: Yamaguchi