Two-component scalar dark matter in $Z_{2n}$ scenarios

TL;DR

This paper explores multi-component scalar dark matter models with even $Z_{2n}$ symmetries, demonstrating their viability and potential detectability in experiments, expanding the understanding of dark matter stability mechanisms.

Contribution

It introduces and analyzes three specific two-component dark matter models based on $Z_4$ and $Z_6$ symmetries, highlighting their broader applicability and experimental prospects.

Findings

Current constraints can be satisfied over wider mass ranges.

New interactions allow for observable signals in direct detection.

Models serve as prototypes for broader classes of $Z_{2n}$ dark matter scenarios.

Abstract

In multi-component scalar dark matter scenarios, a single $Z_N$ ($N\geq 4$) symmetry may account for the stability of different dark matter particles. Here we study the case where $N$ is even ($N=2n$) and two species, a complex scalar and a real scalar, contribute to the observed dark matter density. We perform a phenomenological analysis of three scenarios based on the $Z_4$ and $Z_6$ symmetries, characterizing their viable parameter spaces and analyzing their detection prospects. Our results show that, thanks to the new interactions allowed by the $Z_{2n}$ symmetry, current experimental constraints can be satisfied over a wider range of dark matter masses, and that these scenarios may lead to observable signals in direct detection experiments. Finally, we argue that these three scenarios serve as prototypes for other two-component $Z_{2n}$ models with one complex and one real dark matter particle.