An Extra-Dimensional Model of Dark Matter

TL;DR

This paper proposes a novel extra-dimensional model for dark matter where a SM-singlet Dirac fermion interacts via a new U(1)_z gauge symmetry, naturally explaining its mass and relic abundance while fitting cosmological and experimental data.

Contribution

It introduces an extra-dimensional framework with localized SM fermions and a new gauge symmetry, providing a consistent dark matter candidate with observable signatures.

Findings

Dark matter mass in the multi-TeV range fits observational data.

The model naturally explains the dark matter relic abundance.

Interactions are weak with negligible self-interactions.

Abstract

We present a model for dark matter with extra spatial dimensions in which Standard-Model (SM) fermions have localized wave functions. The underlying gauge group is $G_{\rm SM} \otimes {\rm U}(1)_z$, and the dark matter particle is a SM-singlet Dirac fermion, $\chi$, which is charged under the ${\rm U}(1)_z$ gauge symmetry. We show that the conventional wisdom that the mass of a Dirac fermion is naturally at the ultraviolet cutoff scale does not hold in this model. We further demonstrate that this model yields a dark matter relic abundance in agreement with observation and discuss constraints from direct and indirect searches for dark matter. The dark matter particle interacts weakly with matter and has negligibly small self-interactions. Very good fits to data from cosmological observations and experimental dark matter searches are obtained with $m_\chi$ in the multi-TeV range. A discussion is given of observational signatures and experimental tests of the model.