2024/10/07 by Hajime Fukuda, Fukuda, Hajime, Kohei Kamada +3 · 3 citations
Engineering · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.2410.04701
openalex publication_date 2024/10/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
If the B-L symmetry is gauged with the addition of right-handed neutrinos, the standard model B-L current is anomalous with respect to the B-L gauge field itself. Then, the anomaly relation implies that the magnetic helicity of the B-L gauge field is related to the standard model B-L charges, although the whole universe is B-L neutral with right-handed neutrinos. Based on this, we propose a new leptogenesis scenario with the gauged B-L symmetry as follows. First, the magnetic helicity of the B-L gauge field is generated, e.g., by the axion inflation, together with the standard model and right-handed neutrino B-L charges, with the net B-L charge kept zero. The B-L charges in the standard model and right-handed neutrino sectors are then subject to washout effects from the interactions between them. After the washout effects decouple, the B-L gauge symmetry is Higgsed and the magnetic helicity of the B-L gauge field decays and generates B-L charges in the both sector; thanks to the washout effects, we obtain a non-zero B-L asymmetry. We show that the baryon asymmetry of the universe can be generated in this scenario, discussing the decay of the magnetic helicity of the B-L gauge field and the interactions between the right-handed neutrinos and the standard model particles.