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Early Annihilation and Diffuse Backgrounds in Models of Weakly Interacting Massive Particles in Which the Cross Section for Pair Annihilation Is Enhanced by 1/v

Kamionkowski, Marc and Profumo, Stefano (2008) Early Annihilation and Diffuse Backgrounds in Models of Weakly Interacting Massive Particles in Which the Cross Section for Pair Annihilation Is Enhanced by 1/v. Physical Review Letters, 101 (26). Art. No. 261301. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:KAMprl08

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Abstract

Recent studies have considered modifications to the standard weakly interacting massive particle scenario in which the pair annihilation cross section (times relative velocity v) is enhanced by a factor 1/v~10^-3 in the Galaxy, enough to explain several puzzling Galactic radiation signals. We show that in these scenarios a burst of weakly interacting massive particle annihilation occurs in the first collapsed dark-matter halos. We show that severe constraints to the annihilation cross section derive from measurements of the diffuse extragalactic radiation and from ionization and heating of the intergalactic medium.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.101.261301DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.101.261301PublisherUNSPECIFIED
Additional Information:© 2008 The American Physical Society. Received 20 October 2008; published 29 December 2008. We acknowledge useful comments from N. Arkani-Hamed, J. Feng, D. Finkbeiner, R. Gilmore, M. Pospelov, M. Ritz, and N. Weiner. This work was supported at Caltech by DoE No. DE-FG03-92-ER40701 and the Gordon and Betty Moore Foundation.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Department of EnergyDE-FG03-92-ER40701
Gordon and Betty Moore FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:KAMprl08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KAMprl08
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ID Code:12829
Collection:CaltechAUTHORS
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Deposited On:30 Dec 2008 03:09
Last Modified:26 Dec 2012 10:40

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