http://arxiv.org/abs/1403.2076
The hemispherical power asymmetry observed by Planck and WMAP can be interpreted as being due to a spatially-varying and scale-dependent component of the adiabatic power spectrum. We derive general constraints on the magnitude and scale-dependence of a component with a dipole spatial variation. The spectral index and the running of the spectral index can be shifted from their inflation model values, resulting in a smaller spectral index and a more positive running. A key prediction is a significant hemispherical asymmetry of the spectral index and of its running.
J. McDonald
Tue, 11 Mar 14
44/66