Gamma-ray and radio tests of the e+e- excess from DM annihilations

TL;DR

This paper examines whether dark matter annihilations can explain the e+e- cosmic ray excess, finding that associated gamma-ray and radio emissions conflict with observations unless the dark matter density profile is less steep than standard models.

Contribution

It provides a critical analysis of dark matter annihilation models in light of gamma-ray and radio observational constraints, challenging previous explanations of the cosmic ray excess.

Findings

Gamma-ray and radio emissions from DM annihilations exceed observational limits with standard profiles.

Less steep DM density profiles are required to reconcile models with observations.

Standard NFW and Einasto profiles are incompatible with the excess explanation.

Abstract

PAMELA and ATIC recently reported an excess in e+e- cosmic rays. We show that if it is due to Dark Matter annihilations, the associated gamma-ray flux and the synchrotron emission produced by e+e- in the galactic magnetic field violate HESS and radio observations of the galactic center and HESS observations of dwarf Spheroidals, unless the DM density profile is significantly less steep than the benchmark NFW and Einasto profiles.