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Statistical anisotropy in CMB spectral distortions
Measurements of the cosmic microwave background (CMB) spectral -distortion
anisotropy offer a test for the statistical isotropy of the primordial density
perturbations on . We compute the 1-point
ensemble averages of the -distortion anisotropies which vanish for the
statistically isotropic perturbations. For the quadrupole statistical
anisotropy, we find with the quadruple Legendre coefficient of the
anisotropic powerspectrum and the spherical harmonics
for the preferred direction . Also, we discuss
the cosmic variance of the -distortion anisotropy in the statistically
anisotropic Universe.Comment: 5 pages, 4 figures, published versio
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