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Durham University

Department of Physics

Staff profile

Publication details for Silvia Pascoli

Pascoli, Silvia, Turner, Jessica & Zhou, Ye-Ling (2019). Leptogenesis via a varying Weinberg operator: a semi-classical approach. Chinese Physics C 43(3): 033101.

Author(s) from Durham


In this paper, we introduce leptogenesis via a varying Weinberg operator from a semi-classical perspective. This mechanism is motivated by the breaking of an underlying symmetry which triggers a phase transition that causes the coupling of the Weinberg operator to become dynamical. Consequently, a lepton anti-lepton asymmetry arises from the interference of the Weinberg operator at two different spacetime points. Using the semi-classical approach, we treat the Higgs as a background field and show that a reflection asymmetry between leptons and anti-leptons is generated in the vicinity of the bubble wall. We solve the equations of motion of the lepton and anti-lepton quasiparticles to obtain the final lepton asymmetry.