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On the Viability of Bianchi Type VIIh Models with Dark Energy
T. R. Jaffe, S. Hervik, A. J. Banday +1
We generalize the predictions for the CMB anisotropy patterns arising in Bianchi type VIIh universes to include a dark energy component. We consider these models in light of the re…
Multipole vector anomalies in the first-year WMAP data: a cut-sky analysis
P. Bielewicz, H. K. Eriksen, A. J. Banday +2
We apply the recently defined multipole vector framework to the frequency-specific first-year WMAP sky maps, estimating the low-l multipole coefficients from the high-latitude sky…
CMB component separation by parameter estimation
H. K. Eriksen, C. Dickinson, C. R. Lawrence +9
We propose a solution to the CMB component separation problem based on standard parameter estimation techniques. We assume a parametric spectral model for each signal component, an…
Evidence of vorticity and shear at large angular scales in the WMAP data: a violation of cosmological isotropy?
T. R. Jaffe, A. J. Banday, H. K. Eriksen +2
Motivated by the large-scale asymmetry observed in the cosmic microwave background sky, we consider a specific class of anisotropic cosmological models -- Bianchi type VII_h -- and…