In this talk, the concept of massive Majorana neutrinos is explained; one particular scenario is pointed out by which grand unified theories may lead to "large" neutrino masses; and some astrophysical evidence for a neutrino weighing several tens of electron volts is reviewed.
Aritra Pal, R. Kraetzner, Tim Gruene, Marcel Grapp, Kathrin Schreiber, Mads Grønborg, Henning Urlaub, Stefan Becker, Abdul R. Asif, Jutta Gärtner, In Memory: G.M. Sheldrick (1942–2025), Robert Steinfeld
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