#### [ArXiv] CMB statistics, Sept. 7, 2007

From arxiv/astro-ph:0709.1144v1:

**Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum** by A. R. Pullen and M. Kamionkowski

The authors developed cosmic microwave background statistics for a primordial power spectrum, motivated from the needs of testing the cosmological common assumption, i.e. the statistical isotropy of primordial perturbations. This statistics is for a primordial power spectrum, depending on the direction and the magnitude of the Fourier wavevector. Statistically speaking, the most interesting part is their construction of the ** minimum-variance estimators ** for the coefficients of a spherical-harmonic expansion of the direction-dependence of the primordial power spectrum.