DESY Theory Seminar

Large scale magnetic fields as the origin of baryon asymmetry

by Kohei Kamada (Arizona State U)

Europe/Berlin
seminar room 2, building 2 (DESY Hamburg)

seminar room 2, building 2

DESY Hamburg

Description
Magnetic fields are ubiquitous in the Universe. In particular, recently observational indications of the existence of intergalactic magnetic fields, which may have a cosmological origin, are reported. If they are helical, chiral anomaly in the Standard Model can affect the chiral and baryon asymmetry of the Universe. Here I discuss the cosmological consequence of such magnetic fields. If they originated from a mechanism before or around the electroweak phase transition, it can generate baryon asymmetry without new physics for baryogenesis. Baryon asymmetry generated in this mechanism can survive the sphaleron washout effect. The parameter space that can explain the present Universe lies on the edge of the current constraint. Thus this scenario would be testable in future. We might need BSM physics not for baryogenesis but for magnetogenesis.
Slides