New Constraint on Primordial Lepton Flavor Asymmetries.
Phys Rev Lett
; 130(26): 261803, 2023 Jun 30.
Article
em En
| MEDLINE
| ID: mdl-37450833
ABSTRACT
A chiral chemical potential present in the early Universe can source helical hypermagnetic fields through the chiral plasma instability. If these hypermagnetic fields survive until the electroweak phase transition, they source a contribution to the baryon asymmetry of the Universe. In this Letter, we demonstrate that lepton flavor asymmetries above |µ|/Tâ¼9×10^{-3} trigger this mechanism even for vanishing total lepton number. This excludes the possibility of such large lepton flavor asymmetries present at temperatures above 10^{6} GeV, setting a constraint which is about 2 orders of magnitude stronger than the current CMB and BBN limits.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plasma
/
Desenvolvimento Embrionário
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article