Non-Gaussianities in the Cosmological Perturbation Spectrum due to
  Primordial Anisotropy II
  We continue to investigate possible signatures of a pre-inflationary
anisotropic phase in two-point and three point correlation functions of the
curvature perturbation for high-momentum modes which exit the horizon well
after isotropization. The late time dynamics of these modes is characterized by
a non-Bunch Davies vacuum state which encodes all the information about initial
anisotropy in the background space-time. We observe that, unlike the non-planar
momenta, there exist regimes of planar momenta for which scale invariance of
the power spectrum is strongly broken. This regime of planar momenta gives rise
to enhanced non-Gaussianity in certain squeezed triangle configurations,
although the enhancement of the $f_{NL}$ parameter is limited by the breakdown
of linear perturbation theory at "exact planarity". Finally, we demonstrate
that for the range of planar modes for which scale invariance of the power
spectrum is preserved, non-Gaussianity in the curvature perturbation spectrum
is naturally constrained to be extremely small.
