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High Energy Positrons and the WMAP Haze from Exciting Dark Matter

Authors
  • Cholis, Ilias
  • Goodenough, Lisa
  • Weiner, Neal
Type
Published Article
Publication Date
Jul 28, 2008
Submission Date
Feb 20, 2008
Identifiers
DOI: 10.1103/PhysRevD.79.123505
Source
arXiv
License
Yellow
External links

Abstract

We consider the signals of positrons and electrons from "exciting" dark matter (XDM) annihilation. Because of the light (m_phi ~< 1 GeV) force carrier phi into which the dark matter states can annihilate, the electrons and positrons are generally very boosted, yielding a hard spectrum, in addition to the low energy positrons needed for INTEGRAL observations of the galactic center. We consider the relevance of this scenario for HEAT, PAMELA and the WMAP "haze," focusing on light (m_phi ~< 2 m_pi) phi bosons, and find that significant signals can be found for all three, although significant signals generally require high dark matter densities. We find that measurements of the positron fraction are generally insensitive to the halo model, but do suffer significant astrophysical uncertainties. We discuss the implications for upcoming PAMELA results.

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