New Insights on Lepton Number and Dark Matter

Abstract

Dark matter (DM) is usually assumed to be stabilized by a symmetry, which is mostly considered to be $Z_2$. For example, in supersymmetry it is $R$ parity, i.e. $(-1{)}^{3B+L+2j}$. However, it may be $Z_n$ or $U(1{)}_D$, and derivable from generalized lepton number. In this context, neutrinos may be Majorana or Dirac, and owe their masses to dark matter, i.e. they are scotogenic.

Comments: 8 pages, 4 figures, 2 tables. Talk at NDM2020, Egypt