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Hemispherical power asymmetry: parameter estimation from cosmic microwave background WMAP5 data
2008
Journal of Cosmology and Astroparticle Physics
We reexamine the evidence of the hemispherical power asymmetry, detected in the CMB WMAP data using a new method. At first, we analyze the hemispherical variance ratios and compare these with simulated distributions. Secondly, working within a previously-proposed CMB bipolar modulation model, we constrain model parameters: the amplitude and the orientation of the modulation field as a function of various multipole bins. Finally, we select three ranges of multipoles leading to the most anomalous
doi:10.1088/1475-7516/2008/09/023
fatcat:7w3gfhvednehzoxeixh3iwstbe