Spontaneous Breaking of Lepton Number and Cosmological Domain Wall Problem

Abstract

We show that if global lepton number symmetry is spontaneously broken in a post inflation epoch, then it can lead to the formation of cosmological domain walls. This happens in the well-known "Majoron paradigm" for neutrino mass generation. We propose some realistic examples which allow spontaneous lepton number breaking to be safe from such domain walls.

8 pages, References added, Discussion on Domain Wall Problem Expanded, Conclusions Unchanged, Version Published in Phys. Rev. Lett

References in corpus (9)

• Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
• Decaying warm dark matter and neutrino masses
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• Flavored Peccei-Quinn symmetries in the minimal $\nu$DFSZ model
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