Gamma ray tests of Minimal Dark Matter

TL;DR

This paper analyzes gamma ray signals from Minimal Dark Matter, constraining its properties using astrophysical observations and exploring broader mass ranges, with implications for multi-TeV WIMP dark matter models.

Contribution

It provides the first detailed gamma ray signature analysis of the minimal fermionic hypercharge-less quintuplet dark matter model, including constraints from various astrophysical observations.

Findings

Original model with 9.4 TeV mass is ruled out for cuspy galactic profiles.

Cored profiles and dwarf galaxy observations still allow the model.

Results extend to broader multi-TeV WIMP dark matter scenarios.

Abstract

We reconsider the model of Minimal Dark Matter (a fermionic, hypercharge-less quintuplet of the EW interactions) and compute its gamma ray signatures. We compare them with a number of gamma ray probes: the galactic halo diffuse measurements, the galactic center line searches and recent dwarf galaxies observations. We find that the original minimal model, whose mass is fixed at 9.4 TeV by the relic abundance requirement, is constrained by the line searches from the Galactic Center: it is ruled out if the Milky Way possesses a cuspy profile such as NFW but it is still allowed if it has a cored one. Observations of dwarf spheroidal galaxies are also relevant (in particular searches for lines), and ongoing astrophysical progresses on these systems have the potential to eventually rule out the model. We also explore a wider mass range, which applies to the case in which the relic abundance requirement is relaxed. Most of our results can be safely extended to the larger class of multi-TeV WIMP DM annihilating into massive gauge bosons.