Robust implications on Dark Matter from the first FERMI sky gamma map

TL;DR

This paper establishes model-independent bounds on dark matter annihilation and decay using FERMI gamma-ray data, supporting specific dark matter interpretations of electron/positron excesses and emphasizing the importance of gamma spectra analysis.

Contribution

It provides the first robust, profile-independent bounds on dark matter from FERMI gamma-ray observations, linking gamma spectra to dark matter interpretations of cosmic ray excesses.

Findings

Bounds are mildly dependent on DM density profiles.

Supports DM interpretations involving muons and electrons for cosmic ray excesses.

Future gamma spectra analysis can probe dark matter contributions.

Abstract

We derive robust model-independent bounds on DM annihilations and decays from the first year of FERMI gamma-ray observations of the whole sky. These bounds only have a mild dependence on the DM density profile and allow the following DM interpretations of the PAMELA and FERMI electron/positron excesses: primary channels mu+ mu-, mu+ mu-mu+mu- or e+ e- e+ e-. An isothermal-like density profile is needed for annihilating DM. In all such cases, FERMI gamma spectra must contain a significant DM component, that may be probed in the future.