New features in the Z2xZ2 3HDM two component DM model

Abstract

We investigate the constraints and phenomenology of a three Higgs doublet model (3HDM) with a $\mathbb{Z}2\times \mathbb{Z}2$ symmetry, featuring two inert scalar doublets that give rise to a two-component dark matter (DM) scenario. We analyze the model's vacuum structure, exploring the competition between different symmetry-breaking minima, and subject it to comprehensive theoretical and current experimental constraints. Our analysis reveals previously unexplored regions of parameter space with viable dark matter candidates. Notably, we identify scenarios where both DM particles contribute comparably to the observed relic density, offering distinctive experimental signatures that could guide future searches.

10 pages, 4 figures, talk presented at the conference "My Favourite Dark Matter Model", Apr 14-17, 2025, Azores, to appear in the proceedings published by MPLA