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28 March 2024
 
  » arxiv » 1303.5371

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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
AbstractWe 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
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