APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Tomohiro Fujita (Stanford University)
Title: Large-scale magnetic fields can explain the baryon asymmetry of the universe
Date (JST): Thu, Mar 24, 2016, 17:00 - 18:00
Place: Seminar Room B
Abstract: Helical magnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the Standard Model of particle physics. While they generate no B-L asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. We show that the baryon asymmetry of our Universe can be explained, if the present large-scale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition.