Spontaneous Breaking of Lepton Number and the Cosmological Domain Wall Problem

Lazarides, George (School of Electrical and Computer Engineering, Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece) ; Reig, Mario (AHEP Group, Institut de Física Corpuscular (CSIC-Universitat de València), Parc Científic de Paterna. C/ Catedrático José Beltrán, 2 E-46980 Paterna (Valencia), Spain) ; Shafi, Qaisar (Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA) (Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, Heidelberg D-69120, Germany) ; Srivastava, Rahul (AHEP Group, Institut de Física Corpuscular (CSIC-Universitat de València), Parc Científic de Paterna. C/ Catedrático José Beltrán, 2 E-46980 Paterna (Valencia), Spain) ; Valle, José W. F. (AHEP Group, Institut de Física Corpuscular (CSIC-Universitat de València), Parc Científic de Paterna. C/ Catedrático José Beltrán, 2 E-46980 Paterna (Valencia), Spain)

15 April 2019

Abstract: We show that if global lepton number symmetry is spontaneously broken in a postinflation 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 that allow spontaneous lepton number breaking to be safe from such domain walls.


Published in: Physical Review Letters 122 (2019)
Published by: APS
DOI: 10.1103/PhysRevLett.122.151301
License: CC-BY-4.0



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