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Published July 17, 2009 | public
Journal Article

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

Abstract

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

Additional Information

©2009 The American Physical Society. Received 6 April 2009; revised 14 May 2009; published 17 July 2009.

Additional details

Created:
August 21, 2023
Modified:
October 18, 2023