Electroweak baryogenesis in the standard model with strong hypermagnetic fields

2000/08/14 by Alejandro Ayala, Ayala, Alejandro, Gabriel Pallares +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #astro-ph #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0008142

4 pages, uses RevTeX

arxiv created 2000/08/14 · arxiv updated 2009/11/30

Abstract

We show that in the presence of large scale primordial hypermagnetic fields, it is possible to generate a large amount of CP violation to explain the baryon to entropy ratio during the electroweak phase transition within the standard model. The mechanism responsible for the existence of a CP violating asymmetry is the chiral nature of the fermion coupling to the background field in the symmetric phase which can be used to construct two-fermion interference processes in analogy to the Bohm-Aharanov effect. We estimate that for strong hypermagnetic fields B_Y=(0.3-0.5)T² the baryon to entropy ratio can be rho_B/s=(3 - 6)X10^-11 for slowly expanding bubble walls.

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