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

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. Furthermore, 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.

Authors:

Kamada, Kohei

Publication Date:

Mon May 14 00:00:00 EDT 2018

Research Org.:

Arizona State Univ., Tempe, AZ (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1437071

Alternate Identifier(s):

OSTI ID: 1503871

Grant/Contract Number:  

SC0013605

Resource Type:

Published Article

Journal Name:

Physical Review D

Additional Journal Information:

Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 10; Journal ID: ISSN 2470-0010

Publisher:

American Physical Society

Country of Publication:

United States

Language:

English

Subject:

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS