We propose a "feature-scattering" mechanism to explain the cosmic microwave background cold spot seen from {\it WMAP} and {\it Planck} maps. If there are hidden features in the potential of multi-field inflation, the inflationary trajectory can be scattered by such features. The scattering is controlled by the amount of isocurvature fluctuations, and thus can be considered as a mechanism to convert isocurvature fluctuations into curvature fluctuations. This mechanism predicts localized cold spots (instead of hot ones) on the CMB. In addition, it may also bridge a connection between the cold spot and a dip on the CMB power spectrum at $\ell \sim 20$.
from astro-ph updates on arXiv.org http://ift.tt/1IdS3dN
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