CMB polarization features from inflation versus reionization
CMB polarization features from inflation versus reionization
The angular power spectrum of the cosmic microwave background temperature anisotropy observed by WMAP has an anomalous dip at $\ensuremath{\ell}\ensuremath{\sim}20$ and a bump at $\ensuremath{\ell}\ensuremath{\sim}40$. One explanation for this structure is the presence of features in the primordial curvature power spectrum, possibly caused by a step in the inflationary potential. …