High Energy Positrons and the WMAP Haze from Exciting Dark Matter

Details High Energy Positrons and the WMAP Haze from Exciting Dark Matter High Energy Positrons and the WMAP Haze from Exciting Dark Matter

2008-02-20

arxiv.org/abs/0802.2922v2

Phys.Rev.D79:123505,2009

Astronomy and Astrophysics

Astrophysics

22 pages plus appendix; v2 corrected implementation of GALPROP; included fits to preliminary low energy PAMELA data; higher cr

Scientific paper

10.1103/PhysRevD.79.123505

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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