Phenomenology of a two-component dark matter model

TL;DR

This paper explores a two-component dark matter model with a Dirac fermion and a complex scalar, addressing relic density, self-interactions, and experimental constraints, including future detection prospects.

Contribution

It introduces a novel two-component dark matter framework with a hidden U(1) gauge symmetry, analyzing its phenomenology and experimental viability.

Findings

Dark fermion accounts for the majority of dark matter relic density.

Model evades current direct detection constraints due to lack of coupling to standard model.

Future experiments like SHiP, DUNE, and ILC can probe the model's parameter space.

Abstract

We study a two-component dark matter model consisting of a Dirac fermion and a complex scalar charged under new U(1) gauge group in the hidden sector. The dark fermion plays the dominant component of dark matter which explains the measured DM relic density of the Universe. It has no direct coupling to ordinary standard model particles, thus evading strong constraints from the direct DM detection experiments. The dark fermion is self-interacting through the light dark gauge boson and it would be possible to address that this model can be a resolution to the small scale structure problem of the Universe. The light dark gauge boson, which interacts with the standard model sector, is also stable and composes the subdominant DM component. We investigate the model parameter space allowed by current experimental constraints and phenomenological bounds. We also discuss the sensitivity of future experiments such as SHiP, DUNE and ILC, for the obtained allowed parameter space.