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Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB

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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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.72.083002PublisherUNSPECIFIED
http://link.aps.org/abstract/PRD/v72/e083002PublisherUNSPECIFIED
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.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NASANGT5-50383
Subject Keywords:radiofrequency cosmic radiation; nucleosynthesis; red shift; cosmology
Record Number:CaltechAUTHORS:SWIprd05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SWIprd05
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11102
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:15 Jul 2008 03:32
Last Modified:26 Dec 2012 10:09

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