Switzer, Eric R. and Hirata, Christopher M. (2005) Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB. Physical Review D, 72 (8). Art. No. 083002. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:SWIprd05
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It has been suggested that secondary CMB anisotropies generated by neutral lithium could open a new observational window into the universe around the redshift z~400, and permit a determination of the primordial lithium abundance. The effect is due to resonant scattering in the allowed Li i doublet (2s2S1/2-2p2P1/2,3/2), so its observability depends on the formation history of neutral lithium. Here we show that the ultraviolet photons produced during hydrogen recombination are sufficient to keep lithium in the Li ii ionization stage in the relevant redshift range and suppress the neutral fraction by ~3 orders of magnitude from previous calculations, making the lithium signature unobservable.
|Additional Information:||©2005 The American Physical Society. (Received 6 July 2005; published 7 October 2005) C.H. acknowledges the support of NASA Grant No. NGT5-50383. We acknowledge useful discussions with Uroš Seljak and Avi Loeb.|
|Subject Keywords:||radiofrequency cosmic radiation; nucleosynthesis; red shift; cosmology|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||15 Jul 2008 03:32|
|Last Modified:||26 Dec 2012 10:09|
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