Strongly scale-dependent CMB dipolar asymmetry from super-curvature
  fluctuations
  We reconsider the observed CMB dipolar asymmetry in the context of open
inflation, where a supercurvature mode might survive the bubble nucleation. If
such a supercurvature mode modulates the amplitude of the curvature power
spectrum, it would easily produce an asymmetry in the power spectrum. We show
that current observational data can be accommodated in a three-field model,
with simple quadratic potentials and a non-trivial field-space metric. Despite
the presence of three fields, we believe this model is so far the simplest that
can match current observations. We are able to match the observed strong scale
dependence of the dipolar asymmetry, without a fine tuning of initial
conditions, breaking slow roll or adding a feature to the evolution of any
field.
