The small scale power asymmetry in the cosmic microwave background
  We investigate the hemispherical power asymmetry in the cosmic microwave
background on small angular scales. We find an anomalously high asymmetry in
the multipole range l=601-2048, with a naive statistical significance of 6.5
sigma. However, we show that this extreme anomaly is simply a coincidence of
three other effects, relativistic power modulation, edge effects from the mask
applied, and inter-scale correlations. After correcting for all of these
effects, the significance level drops to ~1 sigma, i.e., there is no anomalous
intrinsic asymmetry in the small angular scales. Using this null result, we
derive a constraint on a potential dipolar modulation amplitude, A(k)<0.0045 on
the ~10 Mpc-scale, at 95% C.L. This new constraint must be satisfied by any
theoretical model attempting to explain the hemispherical asymmetry at large
angular scales.
