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순수물리이론 연구단
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Return of grand unified theory baryogenesis: Source of helical hypermagnetic fields for the baryon asymmetry of the universe

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Title
Return of grand unified theory baryogenesis: Source of helical hypermagnetic fields for the baryon asymmetry of the universe
Author(s)
Kohei Kamada
Publication Date
2018-05
Journal
PHYSICAL REVIEW D, v.97, no.10, pp.103506 -
Publisher
American Physical Society
Abstract
It has been considered that baryogenesis models without a generation of B-L asymmetry such as the GUT baryogenesis do not work since the asymmetry is washed out by the electroweak sphalerons. Here, we point out that helical hypermagnetic fields can be generated through the chiral magnetic effect with a chiral asymmetry generated in such baryogenesis models. The helical hypermagnetic fields then produce baryon asymmetry mainly at the electroweak symmetry breaking, which remains until today. Therefore, the baryogenesis models without B-L asymmetry can still be the origin of the present baryon asymmetry. In particular, if it can produce chiral asymmetry mainly carried by right-handed electrons of order of 10-3 in terms of the chemical potential to temperature ratio, the resultant present-day baryon asymmetry can be consistent with our Universe, although simple realizations of the GUT baryogenesis are hard to satisfy the condition. We also argue the way to overcome the difficulty in the GUT baryogenesis. The intergalactic magnetic fields with B0∼10-16-17 G and λ0∼10-2-3 pc are the smoking gun of the baryogenesis scenario as discussed before. © 2018 authors. Published by the American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/4510
DOI
10.1103/PhysRevD.97.103506
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
Files in This Item:
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