Is the dark matter interpretation of the EGRET gamma excess compatible with antiproton measurements?

Abstract

We investigate the internal consistency of the halo dark matter model which has been proposed by de Boer et al. to explain the excess of diffuse galactic gamma rays observed by the EGRET experiment. Any model based on dark matter annihilation into quark jets, such as the supersymmetric model proposed by de Boer et al., inevitably also predicts a primary flux of antiprotons from the same jets. Since propagation of the antiprotons in the unconventional, disk-dominated type of halo model used by de Boer et al. is strongly constrained by the measured ratio of boron to carbon nuclei in cosmic rays, we investigate the viability of the model using the DarkSUSY package to compute the gamma-ray and antiproton fluxes. We are able to show that their model is excluded by a wide margin from the measured flux of antiprotons. We therefore find that a model of the type suggested by Moskalenko et al., where the intensities of protons and electrons in the cosmic rays vary with galactic position, is far more plausible to explain the gamma excess.

14 pages, 5 figures. Matches published version

Cited by in corpus (23)

• Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects
• Dark Matter: A Primer
• Dark Matter Candidates: A Ten-Point Test
• Baryonic Pinching of Galactic Dark Matter Halos
• Dark matter in the Milky Way, II. the HI gas distribution as a tracer of the gravitational potential
• PAMELA Satellite Data as a Signal of Non-Thermal Wino LSP Dark Matter
• Status, Challenges and Directions in Indirect Dark Matter Searches
• Gamma ray astrophysics: the EGRET results
• The Likely Cause of the EGRET GeV Anomaly and its Implications
• Mirage in the Sky: Non-thermal Dark Matter, Gravitino Problem, and Cosmic Ray Anomalies
• Angular Signatures of Annihilating Dark Matter in the Cosmic Gamma-Ray Background
• Source population synthesis and the Galactic diffuse gamma-ray emission
• SUSY-QCD Corrections to Dark Matter Annihilation in the Higgs Funnel
• Fermi Gamma-ray Space Telescope: High-Energy Results from the First Year
• Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission
• Astrophysical Uncertainties in the Cosmic Ray Electron and Positron Spectrum From Annihilating Dark Matter
• Dark Matter: the Connection with Gamma-Ray Astrophysics
• The diffuse Galactic gamma-rays from dark matter annihilation
• Diffuse $\gamma$-rays and $\bar{p}$ flux from dark matter annihilation -- a model for consistent results with EGRET and cosmic ray data
• A new Determination of the Extragalactic Background of Diffuse Gamma Rays taking into account Dark Matter Annihilation
• SUSY interpretation of the Egret GeV anomaly, Xenon-10 dark matter search limits and the LHC
• Mass limits for heavy neutrinos
• Antimatter and Gamma-rays from Dark Matter Annihilation