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- W2014493447 abstract "Multiple lines of evidence indicate an anomalous injection of high-energy ${e}^{+}{e}^{ensuremath{-}}$ in the galactic halo. The recent ${e}^{+}$ fraction spectrum from the payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. The Fermi gamma-ray space telescope has found a significant hardening of the ${e}^{+}{e}^{ensuremath{-}}$ cosmic-ray spectrum above 100 GeV, with a break, confirmed by HESS at around 1 TeV. The advanced thin ionization calorimeter (ATIC) has also detected a similar excess, falling back to the expected spectrum at 1 TeV and above. Excess microwaves towards the galactic center in the WMAP data are consistent with hard synchrotron radiation from a population of 10--100 GeV ${e}^{+}{e}^{ensuremath{-}}$ (the WMAP ``Haze''). We argue that dark matter annihilations can provide a consistent explanation of all of these data, focusing on dominantly leptonic modes, either directly or through a new light boson. Normalizing the signal to the highest energy evidence (Fermi and HESS), we find that similar cross sections provide good fits to PAMELA and the Haze, and that both the required cross section and annihilation modes are achievable in models with Sommerfeld-enhanced annihilation. These models naturally predict significant production of gamma rays in the galactic center via a variety of mechanisms. Most notably, there is a robust inverse-Compton scattered (ICS) gamma-ray signal arising from the energetic electrons and positrons, detectable at Fermi/GLAST energies, which should provide smoking gun evidence for this production." @default.
- W2014493447 created "2016-06-24" @default.
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- W2014493447 date "2009-12-15" @default.
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- W2014493447 title "Case for a<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>700</mml:mn><mml:mo>+</mml:mo><mml:mi>GeV</mml:mi></mml:math>WIMP: Cosmic ray spectra from PAMELA, Fermi, and ATIC" @default.
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- W2014493447 doi "https://doi.org/10.1103/physrevd.80.123518" @default.
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