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<p>If the <i>B</i> – <i>L</i> symmetry is gauged with the addition of right-handed neutrinos, the standard model <i>B</i> – <i>L</i> current is anomalous with respect to the <i>B</i> – <i>L</i> gauge field itself. Then, the anomaly relation implies that the magnetic helicity of the <i>B</i> – <i>L</i> gauge field is related to the standard model <i>B</i> – <i>L</i> charges, although the whole universe is <i>B</i> – <i>L</i> neutral with right-handed neutrinos. Based on this, we propose a new leptogenesis scenario with the gauged <i>B</i> – <i>L</i> symmetry as follows. First, the magnetic helicity of the <i>B</i> – <i>L</i> gauge field is generated, e.g., by the axion inflation, together with the standard model and right-handed neutrino <i>B</i> – <i>L</i> charges, with the net <i>B</i> – <i>L</i> charge kept zero. The <i>B</i> – <i>L</i> 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 <i>B</i> – <i>L</i> gauge symmetry is Higgsed and the magnetic helicity of the <i>B</i> – <i>L</i> gauge field decays and generates <i>B</i> – <i>L</i> charges in the both sector; thanks to the washout effects, we obtain a non-zero <i>B</i> – <i>L</i> 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 <i>B</i> – <i>L</i> gauge field and the interactions between the right-handed neutrinos and the standard model particles.</p>

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Leptogenesis from magnetic helicity of gauged U(1)B−L

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月27日

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  • Hajime Fukuda,
  • Kohei Kamada,
  • Thanaporn Sichanugrist

摘要

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.