http://arxiv.org/abs/1403.2567
We relate the observed hemispherical anisotropy in the cosmic microwave radiation data to an anisotropic power spectrum model. The hemispherical anisotropy can be parameterized in terms of the dipole modulation model. This model also leads to correlations between spherical harmonic coefficients corresponding to multipoles l and l+1. We extract the l dependence of the dipole modulation amplitude, A, by making a fit to the l dependence of the correlations betweenharmonic coefficients using PLANCK CMBR data. We propose an anisotropic power spectrum model which also leads to correlations between different multipoles. This power spectrum is determined by making a fit to data. We find that the spectral index of the anisotropic power spectrum is consistent with zero.
P. Rath and P. Jain
Wed, 12 Mar 14
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