Can cosmological magnetic fields explain the Baryon Asymmetry of the Universe?

by Kohei Kamada (Arizona State University)

Friday 8 Jul 2016, 12:00 → 13:00 Europe/Madrid

IFAE Seminar room (IFAE)

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 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. In order to explain the present baryon asymmetry of the Universe, we need another trick or fine-tuning, though.