Decaying Dark Matter can explain the electron/positron excesses

Abstract

PAMELA and ATIC recently reported excesses in e+ e- cosmic rays. Since the interpretation in terms of DM annihilations was found to be not easily compatible with constraints from photon observations, we consider the DM decay hypothesis and find that it can explain the e+ e- excesses compatibly with all constraints, and can be tested by dedicated HESS observations of the Galactic Ridge. ATIC data indicate a DM mass of about 2 TeV: this mass naturally implies the observed DM abundance relative to ordinary matter if DM is a quasi-stable composite particle with a baryon-like matter asymmetry. Technicolor naturally yields these type of candidates.

20 pages, 7 figures

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Cited by in corpus (24)

• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
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• Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies
• Nonabelian dark matter: models and constraints
• Dark Matter Signals from Cascade Annihilations
• Positrons and antiprotons from inert doublet model dark matter
• Discriminating different scenarios to account for the cosmic $e^{\pm }$ excess by synchrotron and inverse Compton radiation
• Dark matter and sub-GeV hidden U(1) in GMSB models
• Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
• Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data
• Decaying Dark Matter as a Probe of Unification and TeV Spectroscopy
• The Leptonic Higgs as a Messenger of Dark Matter
• Anomaly Induced Dark Matter Decay and PAMELA/ATIC Experiments
• Phenomenology of Dark Matter annihilation into a long-lived intermediate state
• R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments
• Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess
• Galactic Signatures of Decaying Dark Matter
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
• R-parity preserving super-WIMP decays
• Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission
• PAMELA/ATIC Anomaly from Exotic Mediated Dark Matter Decay
• Decaying neutralino dark matter in anomalous $U(1{)}_H$ models
• The Electroweak Phase Transition in Ultra Minimal Technicolor
• Small steps towards Grand Unification and the electron/positron excesses in cosmic-ray experiments