Fermion number violating effects in low scale leptogenesis

Abstract

The existence of baryon asymmetry and dark matter in the Universe may be related to CP-violating reactions of three heavy neutral leptons (HNLs) with masses well below the Fermi scale. The dynamical description of the lepton asymmetry generation, which is the key ingredient of baryogenesis and of dark matter production, is quite complicated due to the presence of many different relaxation time scales and the necessity to include quantum-mechanical coherent effects in HNL oscillations. We derive kinetic equations accounting for fermion number violating effects missed so far and identify one of the domains of HNL masses that can potentially lead to large lepton asymmetry generation boosting the sterile neutrino dark matter production.

10 pages, 10 figures, Journal version with corrected misprints

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• Improved constraints on lepton asymmetry from the cosmic microwave background
• Baryogenesis from L-violating Higgs-doublet decay in the density-matrix formalism
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• Sterile neutrino dark matter via coinciding resonances
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• Relativistic and spectator effects in leptogenesis with heavy sterile neutrinos
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• Baryogenesis and Dark Matter from Freeze-In
• Tests of Low-Scale Leptogenesis in Charged Lepton Flavour Violation Experiments
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• Robustness of ARS Leptogenesis in Scalar Extensions
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