Scale-Invariant Two Component Dark Matter

TL;DR

This paper proposes a scale-invariant extension of the standard model with two-component dark matter, reducing parameters and exploring astrophysical and laboratory signatures, highlighting the dominant role of spinor dark matter in relic density.

Contribution

It introduces a novel scale-invariant two-component dark matter model with fewer parameters and analyzes its experimental signatures and constraints.

Findings

Spinor dark matter primarily accounts for relic density.

Parameter space constrained by Higgs decay experiments.

Dark matter self-interactions saturate constraints in resonant regions.

Abstract

We study a scale invariant extension of the standard model which can explain simultaneously dark matter and the hierarchy problem. In our set-up, we introduce a scalar and a spinor as two-component dark matter in addition to scalon field as a mediator. Interesting point about our model is that due to scale invariant conditions, compared to other two-component dark matter models, it has lower independent parameters. Possible astrophysical and laboratory signatures of two-component dark matter candidate are explored and it is shown that the most contribution of observed relic density of dark matter can be determined by spinor dark matter. Detectability of these dark matter particles is studied and the direct and invisible Higgs decay experiments are used to rule out part of the parameter space of the model. In addition, the dark matter self-interactions are considered and shown that their contribution saturate this constraint in the resonant regions.