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Testing the isotropy of the Cosmic Microwave Backround | | F. K. Hansen
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17 Jun 2004 | | Subject: | astro-ph | | Abstract: | There have recently been several claims of an asymmetric distribution of large scale fluctuations in the WMAP data. I review some recent results from a test of isotropy of the power spectrum at all scales and show how the power is asymmetrically distributed for the multipole range l=5-40 in three WMAP frequency channels. I compare this to a recent detection of a non-Gaussian signal in one part of the sky using the local curvature properties of the cosmic microwave background fluctuation field. I find that there may be a common origin of these two findings due to a similar direction and frequency independence of the results. | | Source: | arXiv, astro-ph/0406393 | | Services: | Forum | Review | PDF | Favorites | |
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