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

Lingenfelter, R. E. and Higdon, J. C. and Rothschild, R. E. (2009) Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation? Physical Review Letters, 103 (3). 031301. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20090824-131753981

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.103.031301DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.103.031301PublisherUNSPECIFIED
Additional Information:©2009 The American Physical Society. Received 6 April 2009; revised 14 May 2009; published 17 July 2009.
Subject Keywords:PACS: 95.35.+d; 26.40.+r; 98.70.Rz; 98.70.Vc
Issue or Number:3
Record Number:CaltechAUTHORS:20090824-131753981
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090824-131753981
Official Citation:Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation? R. E. Lingenfelter, J. C. Higdon, and R. E. Rothschild, Phys. Rev. Lett. 103, 031301 (2009), DOI:10.1103/PhysRevLett.103.031301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15275
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Sep 2009 21:27
Last Modified:03 Oct 2019 00:56

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