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Small angular scale CMB anisotropies from CBI and BIMA experiments: Early universe or local structures?

Cooray, Asantha and Melchiorri, Alessandro (2002) Small angular scale CMB anisotropies from CBI and BIMA experiments: Early universe or local structures? Physical Review D, 66 (8). Art. No. 083001. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:COOprd02b

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Abstract

The advent of high-resolution cosmic microwave background (CMB) experiments now allows studies on the temperature fluctuations at scales corresponding to a few arcminutes and below. Though the reported excess power at l∼2000-6000 by CBI and BIMA is roughly consistent with a secondary contribution resulting from the Sunyaev-Zeldovich effect, this requires a higher normalization for the matter power spectrum than measured by other means. In addition to a local redshift contribution, another strong possibility for anisotropies at very small scales involves nonstandard aspects of inflationary models. To distinguish between contributions from early universe and local structures, including a potential point source contribution, and to understand the extent to which structures at low redshifts contribute to small-scale temperature anisotropies, it may be necessary to perform a combined study involving CMB and the large-scale structure. We suggest a cross correlation of the temperature data with a map of the large-scale structure, such as the galaxy distribution. For next generation small angular scale CMB experiments, multifrequency observations may be a necessary aspect to allow an additional possibility to distinguish between these different scenarios.


Item Type:Article
Additional Information:©2002 The American Physical Society. Received 20 April 2002; published 4 October 2002. We wish to thank Martin Kunz, Louise Griffiths, and Joe Silk for helpful comments. This work was supported at Caltech by the Sherman Fairchild Foundation and DOE Grant No. DE-FG03-92-ER40701. A.M. is supported by PPARC.
Group:TAPIR
Record Number:CaltechAUTHORS:COOprd02b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:COOprd02b
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.66.083001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10987
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:21 Jun 2008
Last Modified:26 Dec 2012 10:07

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