Scalar dark matter in an extra dimension inspired model

TL;DR

This paper explores a model where a singlet scalar in a large extra dimension acts as dark matter, analyzing how Kaluza-Klein modes influence relic density and detection prospects.

Contribution

It introduces a novel extra-dimensional model with a singlet scalar, examining the effects of Kaluza-Klein modes on dark matter relic density and detection signals.

Findings

Kaluza-Klein modes affect relic density calculations.

Coannihilation impacts direct and indirect detection signals.

Model reduces to standard singlet dark matter for large mass splittings.

Abstract

In this work we consider a singlet scalar propagating in a flat large extra dimension. The first Kaluza-Klein mode associated to this singlet scalar will be a viable dark matter candidate. The tower of new particles enriches the calculation of the relic density due effect of coannihilation. For large mass splitting, the model converges to the predictions of the singlet dark matter model. For nearly degenerate mass spectrum, coannihilations increase the cross sections used for direct and indirect dark matter searches. We investigate the impact of the Kaluza-Klein tower associated to singlet scalar for indirect and direct detection of dark matter.