Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 86: Neutrino Physics (Theory) 1 and Theoretical Astroparticle Physics and Cosmology 1

T 86.1: Talk

Thursday, March 24, 2022, 16:15–16:30, T-H17

Majoron Models without Domain Walls — •Tim Brune — TU Dortmund

In the singlet Majoron model, neutrino masses arise due to the spontaneous violation of lepton number. Apart from providing a viable dark matter candidate, the model can also explain the generation of a baryon asymmetry via Leptogenesis. However, the Majoron model suffers from the existence of cosmological domain walls, contradicting observations. I present extensions of the Majoron model by additional right-handed doublets and triplets that render it domain wall free. Besides avoiding the existence of domain walls, the additional particles have a non-trivial effect on the Sphaleron process that converts the lepton asymmetry to a baryon asymmetry in Leptogenesis models.