Cuts, Cancellations and the Closed Time Path: The Soft Leptogenesis Example

Abstract

By including all leading quantum-statistical effects at finite temperature, we show that no net asymmetry of leptons and sleptons is generated from soft leptogenesis, save the possible contribution from the resonant mixing of sneutrinos. This result contrasts with different conclusions appearing in the literature that are based on an incomplete inclusion of quantum statistics. We discuss vertex and wave-function diagrams as well as all different possible kinematic cuts that nominally lead to CP-violating asymmetries. The present example of soft leptogenesis may therefore serve as a paradigm in order to identify more generally applicable caveats relevant to alternative scenarios for baryogenesis and leptogenesis, and it may provide useful guidance in constructing viable models.

38 pages

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Cited by in corpus (15)

• The Phenomenology of Right Handed Neutrinos
• Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant Leptogenesis
• Why is there more matter than antimatter? Calculational methods for leptogenesis and electroweak baryogenesis
• Status of rates and rate equations for thermal leptogenesis
• Lepton asymmetry from mixing and oscillations
• Leptogenesis and the Higgs Portal
• Towards Cogenesis via Asymmetric Freeze-in: The $\chi$ Who Came-in from the Cold
• Flavour mixing transport theory and resonant leptogenesis
• Cutting rules on a cylinder: a bottom-up approach to quantum kinetic theory for the early universe
• Nonthermal $CP$ violation in soft leptogenesis
• Mass-derivative relations and unitarity constraints for $CP$ asymmetries at finite temperature
• Leptogenesis in an extended seesaw model with $U(1{)}_{B-L}$ symmetry
• Leptogenesis in supersymmetry with one $L$ violating coupling
• Naturalness in Soft Leptogenesis and Gravitino Mass Bound due to Primordial Black Holes
• $CPT$ and unitarity constraints for higher-order $CP$ asymmetries at finite temperature