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Charged-particle decay and suppression of primordial power on small scales

Sigurdson, Kris and Kamionkowski, Marc (2004) Charged-particle decay and suppression of primordial power on small scales. Physical Review Letters, 92 (17). Art. No. 171302. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:SIGprl04

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Abstract

We study the suppression of the small-scale power spectrum due to the decay of charged matter to dark matter prior to recombination. Prior to decay, the charged particles couple to the photon-baryon fluid and participate in its acoustic oscillations. However, after these charged particles decay to neutral dark matter, the photon-baryon fluid is coupled only gravitationally to the newly created dark matter. This generically leads to suppression of power on length scales that enter the horizon prior to decay. For decay times of ~3.5 yr this leads to suppression of power on subgalactic scales, bringing the observed number of galactic substructures in line with observation. Decay times of a few years are possible if the dark matter is purely gravitationally interacting, such as the gravitino in supersymmetric models or a massive Kaluza-Klein graviton in models with universal extra dimensions.


Item Type:Article
Additional Information:©2004 The American Physical Society. Received 20 November 2003; published 27 April 2004. K.S. acknowledges the support of the Canadian NSERC. This work was supported in part by NASA NAG5-9821 and DoE DE-FG03-92-ER40701.
Subject Keywords:dark matter; cosmology
Record Number:CaltechAUTHORS:SIGprl04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SIGprl04
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.92.171302
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7082
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jan 2007
Last Modified:26 Dec 2012 09:28

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