English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The dark matter may consist not of one elementary particle but of differentspecies, each of them contributing a fraction of the observed dark matterdensity. A major theoretical difficulty with this scenario --dubbedmulti-component dark matter-- is to explain the stability of these distinctparticles. Imposing a single $Z_N$ symmetry, which may be a remnant of aspontaneously broken $U(1)$ gauge symmetry, seems to be the simplest way tosimultaneously stabilize several dark matter particles. In this paper wesystematically study scenarios for multi-component dark matter based on various$Z_N$ symmetries ($N\leq 10$) and with different sets of scalar fields chargedunder it. A generic feature of these scenarios is that the number of stableparticles is not determined by the Lagrangian but depends on the relationsamong the masses of the different fields charged under the $Z_N$ symmetry. Weexplicitly obtain and illustrate the regions of parameter space that areconsistent with up to five dark matter particles. For $N$ odd, all theseparticles turn out to be complex, whereas for $N$ even one of them may be real.Within this framework, many new models for multi-component dark matter can beimplemented.

Multi-component scalar dark matter from a $Z_N$ symmetry: a systematic analysis