The PAMELA and ATIC Excesses From a Nearby Clump of Neutralino Dark Matter

Abstract

In this letter, we suggest that a nearby clump of 600-1000 GeV neutralinos may be responsible for the excesses recently observed in the cosmic ray positron and electron spectra by the PAMELA and ATIC experiments. Although neutralino dark matter annihilating throughout the halo of the Milky Way is predicted to produce a softer spectrum than is observed, and violate constraints from cosmic ray antiproton measurements, a large nearby (within 1-2 kiloparsecs of the Solar System) clump of annihilating neutralinos can lead to a spectrum which is consistent with PAMELA and ATIC, while also producing an acceptable antiproton flux. Furthermore, the presence of a large dark matter clump can potentially accommodate the very large annihilation rate required to produce the PAMELA and ATIC signals.

4 pages, 2 figures

References in corpus (7)

• A Theory of Dark Matter
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Cosmic rays from Leptonic Dark Matter
• Constraining Supersymmetric Dark Matter With Synchrotron Measurements
• Local dark matter clumps and the cosmic ray positron excess

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• PAMELA, DAMA, INTEGRAL and Signatures of Metastable Excited WIMPs
• Cosmic ray lepton puzzle in the light of cosmological N-body simulations
• TASI 2008 Lectures on Dark Matter
• Explaining PAMELA and WMAP data through Coannihilations in Extended SUGRA with Collider Implications
• ATIC, PAMELA, HESS, Fermi and nearby Dark Matter subhalos
• Dark Matter Indirect Signatures
• Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess
• Dark Matter as a Guide Toward a Light Gluino at the LHC
• Type II Seesaw and the PAMELA/ATIC Signals
• Systematic study of the uncertainties in fitting the cosmic positron data by AMS-02
• Black Holes in our Galactic Halo: Compatibility with FGST and PAMELA Data and Constraints on the First Stars
• Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology
• Primordial Black Hole as a Source of the Boost Factor
• Exploring SUSY light Higgs boson scenarios via dark matter experiments
• Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball Decay
• Dark Stars and Boosted Dark Matter Annihilation Rates
• On discrepancy between ATIC and Fermi data
• An observable electron-positron anisotropy cannot be generated by dark matter
• Analysis of the Positron Fraction and the Spectrum of the Electronic Component in Cosmic Rays
• Measurement of High Energy Gamma Rays from 200 MeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station