Published October 15, 2005
| Published
Journal Article
Open
Ionizing radiation from hydrogen recombination strongly suppresses the lithium scattering signature in the CMB
- Creators
- Switzer, Eric R.
-
Hirata, Christopher M.
Chicago
An error occurred while generating the citation.
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.
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.Attached Files
Published - SWIprd05.pdf
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Additional details
- Eprint ID
- 11102
- Resolver ID
- CaltechAUTHORS:SWIprd05
- NASA
- NGT5-50383
- Created
-
2008-07-15Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field
- Caltech groups
- TAPIR