Dark matter as a localized scalar in the extra dimension

TL;DR

This paper explores a model where a scalar field in an extra dimension could serve as dark matter, with its properties and annihilation rate depending on the extra dimension's size and the scalar's localization.

Contribution

It introduces a localized scalar dark matter candidate in a single extra dimension and analyzes how its annihilation rate relates to extra-dimensional parameters.

Findings

Scalar zero mode localized away from origin

Annihilation rate sensitive to extra dimension size

Estimated scalar position based on relic density

Abstract

We consider a standard model singlet which is accessible to a single extra dimension and its zero mode is localized with Gaussian profile around a point different than the origin. This zero mode scalar is a possible candidate for the dark matter and its annihilation rate is sensitive to the compactification radius of the extra dimension, the localization width and the position. For the case of non resonant annihilation, we estimated the dark matter scalar location around a point, at a distance \sim 3 \times localization width from the origin, by using the annihilation rate which is based on the current relic density.