CMB Cold Spot from Inflationary Feature Scattering
  We propose a "feature-scattering" mechanism to explain the cosmic microwave
background cold spot seen from WMAP and 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 $\ell \sim 20$.
