Gamma rays from the annihilation of singlet scalar dark matter

TL;DR

This paper analyzes gamma ray signals from singlet scalar dark matter annihilation, constraining its properties and showing many scenarios are detectable by Fermi-GLAST.

Contribution

It provides a comprehensive calculation of gamma ray flux from singlet scalar dark matter, updating the parameter space considering relic density and detection constraints.

Findings

Singlet scalar dark matter mass must be >50 GeV due to detection constraints.

A significant portion of the viable parameter space is within Fermi-GLAST sensitivity.

The model's parameter space is effectively reduced to two variables: singlet mass and Higgs mass.

Abstract

We consider an extension of the Standard Model by a singlet scalar that accounts for the dark matter of the Universe. Within this model we compute the expected gamma ray flux from the annihilation of dark matter particles in a consistent way. To do so, an updated analysis of the parameter space of the model is first presented. By enforcing the relic density constraint from the very beginning, the viable parameter space gets reduced to just two variables: the singlet mass and the higgs mass. Current direct detection constraints are then found to require a singlet mass larger than 50 GeV. Finally, we compute the gamma ray flux and annihilation cross section and show that a large fraction of the viable parameter space lies within the sensitivity of Fermi-GLAST.