Bhattacharya, S and Chakrabarty, N and Roshan, R and Sil, A (2020) Multicomponent dark matter in extended U(1)B-L: neutrino mass and high scale validity. In: Journal of Cosmology and Astroparticle Physics, 2020 (4).
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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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Cosmology and Astroparticle Physics |
| Publisher: | Institute of Physics Publishing |
| Additional Information: | The copyright of this article belongs to Institute of Physics Publishing |
| Department/Centre: | Division of Physical & Mathematical Sciences > Centre for High Energy Physics |
| Date Deposited: | 30 Mar 2021 09:23 |
| Last Modified: | 30 Mar 2021 09:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/65496 |
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