Multicomponent dark matter in extended U(1)<sub><i>B</i>−<i>L</i></sub>: neutrino mass and high scale validity
Subhaditya Bhattacharya, Nabarun Chakrabarty, Rishav Roshan, Arunansu Sil
Abstract
Standard Model with right handed neutrinos charged under additional U(1)B-L gauge symmetry offer solutions to both dark matter (DM) problem and neutrino mass generation, although constrained severely from relic density, direct search and Higgs vacuum stability. We therefore investigate a multicomponent DM scenario augmented by an extra inert scalar doublet, that is neutral under U(1)B-L, which aids to enlarge parameter space allowed by DM constraints and Higgs vacuum stability. The lightest right-handed neutrino and the CP-even inert scalar are taken as the dark matter candidates and constitute a two component dark matter framework as they are rendered stable by an unbroken 2 � 2 � symmetry. DM-DM conversion processes turn out crucial to render requisite relic abundance in mass regions of the RH neutrino that do not appear in the stand-alone U(1)B-L scenario. In addition, the one-loop renormalisation group (RG) equations in this model demonstrate that the electroweak (EW) vacuum can be stabilised till � 109 GeV in a parameter region compatible with the observed relic, the direct detection bound and other relevant constraints. We finally comment on the possibility of including the freeze-in mechanism in the same set-up. © 2020 IOP Publishing Ltd and Sissa Medialab.