Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation?

Details Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation? Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation?

2009-04-06

arxiv.org/abs/0904.1025v3

Phys.Rev.Lett.103:031301,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, no figures, 85 references, revised version accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.031301

Assuming Galactic positrons do not go far before annhilating, a difference between the observed 511 keV annihilation flux distribution and that of positron production, expected from beta-plus decay in Galactic iron nucleosynthesis, was evoked as evidence of a new source and a signal of dark matter. We show, however, that the dark mater sources can not account for the observed positronium fraction without extensive propagation. Yet with such propagation, standard nucleosynthetic sources can fully account for the spatial differences and the positronium fraction, leaving no signal for dark mater to explain.

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