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Article overview
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Directional dependence of LCDM cosmological parameters | M. Axelsson
; Y. Fantaye
; F. K. Hansen
; A. J. Banday
; H. K. Eriksen
; K. M. Gorski
; | Date: |
21 Mar 2013 | Abstract: | We study the previously discovered hemispherical power asymmetry (Eriksen et
al. 2004, Hansen et al. 2004, Hansen et al. 2009) with the WMAP 9-year data. We
find that the asymmetry is statistically significant at the 3.2 sigma
confidence level for l=2--600, where the data is signal dominated, using the
WMAP 9-year KQ85 mask. The preferred asymmetry direction is (l,b)=(227,-27), 44
degrees away from the Ecliptic South Pole. Individual asymmetry axes estimated
from six independent multipole ranges are all consistent with this direction.
This agreement across a wide range of scales argues against a statistical
a-posterior’ interpretation of the effect. We estimate cosmological parameters
on different parts of the sky and show that the parameters A_s, n_s and
Omega_b are the most sensitive to the asymmetrically distributed power
asymmetry. In particular, for the two opposite hemispheres aligned with the
preferred asymmetry axis, we find n_s = 0.96 pm 0.022 and n_s = 0.99 pm
0.024, respectively. | Source: | arXiv, 1303.5371 | Services: | Forum | Review | PDF | Favorites |
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