Photons from Dark Matter in a (non-Universal) Extra Dimension model

TL;DR

This paper investigates the multi-wavelength signals from a dark matter candidate in a non-universal extra dimension model, focusing on potential gamma-ray and radio observations at the Galactic center.

Contribution

It provides the first detailed predictions of indirect signals from a specific Kaluza-Klein dark matter candidate within a non-universal extra dimension framework.

Findings

Next-generation gamma-ray and radio telescopes can test the model.

Detection of monochromatic gamma-ray emission is possible under certain conditions.

The model's signals are faint unless there is a significant dark matter density enhancement at the Galactic center.

Abstract

We study the multi-wavelength signal induced by pairs annihilations at the Galactic center (GC) of a recently proposed dark matter (DM) candidate. The weakly interacting massive particle (WIMP) candidate, named A_, is the first Kaluza-Klein mode of a five dimensional Abelian gauge boson. Electroweak precision tests and the DM cosmological bound constrain its mass and pair annihilation rate in small ranges, leading to precise predictions of indirect signals from what concerns the particle physics side. The related multi-wavelength emission is expected to be faint, unless a significant enhancement of the DM density is present at the GC. We find that in this case, and depending on few additional assumptions, the next generation of gamma-ray and wide-field radio observations can test the model, possibly even with the detection of the induced monochromatic gamma-ray emission.