Spontaneous Breaking of Lepton Number and Cosmological Domain Wall Problem

George Lazarides , Mario Reig , Qaisar Shafi , Rahul Srivastava , Jos\'E W. F. Valle

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classification ✦ hep-ph astro-ph.CO

keywords domainleptonnumberbreakingcosmologicalspontaneouswallsallow

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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.

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