CMB statistical anisotropies of classical and quantum origins
  We examine the impact of different anisotropic relics on inflation, in
particular the predictions on the density perturbations. These relics can be
the source of the large scale anomalies in the cosmic microwave background.
There are two different types of background relics, one from the matter sector
and the other purely from the metric. Although the angular-dependence of the
statistical anisotropy in both cases are degenerate, the scale-dependence are
observationally distinctive. In addition, we demonstrate that non-Bunch-Davies
vacuum states can extend the statistical anisotropy to much shorter scales, and
leave a scale-dependence that is insensitive to the different backgrounds but
sensitive to the initial quantum state.
