Resonant Leptogenesis

By Apostolos Pilaftsis, University of Manchester

I will first briefly review the theoretically appealing scenario of baryogenesis through leptogenesis induced by the out-of-equilibrium decays of heavy Majorana neutrinos. Then, I will present recent progress made on an interesting scenario, called resonant leptogenesis, in which the phenomenon of separation of leptons from anti-leptons gets resonantly amplified when a pair of heavy Majorana neutrinos has a mass difference comparable to their decay widths. In particular, I will show how resonant leptogenesis can be realized with heavy Majorana neutrinos even as light as 0.5-1 TeV, in complete agreement with the current solar and atmospheric neutrino data. The prospects of probing this novel scenario of baryogenesis in low-energy and collider experiments will be briefly discussed.