Electroweak baryogenesis induced by a scalar field

A cosmological pseudoscalar field coupled to hypercharge topological number density can exponentially amplify hyperelectric and hypermagnetic fields w hile coherently rolling or oscillating, leading to the formation of a time- dependent condensate of topological number density. The topological condens ate can be converted, under certain conditions, into baryons in sufficient quantity to explain the observed baryon asymmetry in the Universe. The ampl ified hypermagnetic field can perhaps sufficiently strengthen the electrowe ak phase transition, and by doings so save any preexisting baryon number as ymmetry from extinction. [S0031-9007(99)08807-9].