A test of the Poincaré dodecahedral space topology hypothesis with the WMAP CMB data
Abstract
It has been suggested by Roukema and coworkers (hereafter R04) that the topology of the Universe as probed by the “matched circles” method using the first year release of the WMAP CMB data, might be that of the Poincaré dodecahedral space (PDS) model. An excess in the correlation of the “identified circles” was reported by R04, for circles of angular radius of ~11° for a relative phase twist 36°, hinting that this could be due to a Clifford translation, if the hypothesized model were true. R04 did not however specify the statistical significance of the correlation signal. We investigate the statistical significance of the signal using Monte Carlo CMB simulations in a simply connected Universe, and present an updated analysis using the threeyear WMAP data. We find that our analyses of the first and three year WMAP data provide results that are consistent with the simply connected space at a confidence level as low as 68%.
Appendix is only available in electronic form at http://www.aanda.org
 Publication:

Astronomy and Astrophysics
 Pub Date:
 May 2008
 DOI:
 10.1051/00046361:20078777
 arXiv:
 arXiv:0801.1358
 Bibcode:
 2008A&A...482..747L
 Keywords:

 cosmology: observations;
 cosmology: cosmic microwave background;
 cosmology: cosmological parameters;
 Astrophysics
 EPrint:
 8 pages, 6 figures, typo corrected/replaced to match version published in A&