Quantum Leptogenesis I

Understand

Thermal leptogenesis explains the observed matter-antimatter asymmetry of the universe in terms of neutrino masses, consistent with neutrino oscillation experiments.

• We present a full quantum mechanical calculation of the generated lepton asymmetry based on Kadanoff-Baym equations.
• Origin of the asymmetry is the departure from equilibrium of the statistical propagator of the heavy Majorana neutrino, together with CP violating couplings.
• The lepton asymmetry is calculated directly in terms of Green's functions without referring to "number densities".