EDP Sciences
Free Access
Issue
A&A
Volume 482, Number 3, May II 2008
Page(s) 747 - 753
Section Cosmology (including clusters of galaxies)
DOI https://doi.org/10.1051/0004-6361:20078777
Published online 04 March 2008


A&A 482, 747-753 (2008)
DOI: 10.1051/0004-6361:20078777

A test of the Poincaré dodecahedral space topology hypothesis with the WMAP CMB data

B. Lew1, 2 and B. Roukema1

1  Torun Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, 87-100 Torun, Poland
2  Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602, Japan
    e-mail: blew@a.phys.nagoya-u.ac.jp

(Received 2 October 2007 / Accepted 7 January 2008)

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 three-year 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%.


Key words: cosmology: observations -- cosmology: cosmic microwave background -- cosmology: cosmological parameters



© ESO 2008

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.