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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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.
|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.|
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|Deposited On:||30 Dec 2008 03:09|
|Last Modified:||26 Dec 2012 10:40|
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