Hidden SU(2)_D vector dark matter with a scalar septuplet

TL;DR

This paper introduces a vector dark matter model based on a hidden SU(2)_D gauge symmetry with a scalar septuplet, analyzing its vacuum configurations, RG evolution, and experimental constraints, and identifying viable parameter space.

Contribution

It presents a novel dark matter model with a scalar septuplet that influences gauge boson masses and provides testable predictions for future experiments.

Findings

Two vacuum configurations with different gauge boson mass spectra.

Perturbativity and vacuum stability impose strong bounds on parameters.

Viable parameter space consistent with current dark matter constraints.

Abstract

We propose a vector dark matter model from a hidden SU(2)_D gauge symmetry at TeV scale. A scalar septuplet is introduced to break the SU(2)_D symmetry spontaneously. The septuplet also play the role of a portal between the standard model and the dark sector. We find that there are two different vacuum configurations corresponding to the sign of the quartic coupling $\lambda_3$, which yields different mass spectrum for the gauge bosons. For a $\lambda_3<0$, the masses of gauge bosons are splitting, while for a $\lambda_3\geq0$, the masses are degenerate. We also study the RG evolutions of the couplings, and find that the perturbativity and vacuum stability can set a stringent bound on the parameter space. For the phenomenological aspect, we consider the experimental constraints including dark matter direct detection, indirect detection, relic density, and Higgs couplings measurements. We find that there are parameter space survive from all the constraints, and they can be tested in future dark matter direct and indirect detection experiments.