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VOLUME 69 | ISSUE 6 | PAGE 395
Classification of singular points in polarization field of cosmic microwave background and eigenvectors of Stokes matrix
PACS: 98.70.Vc
Analysis of the singularities of the polarization field of CMB, where polarization is equal to zero, is presented. It is found that the classification of the singular points differs from the usual three types known in the ordinary differential equations. The new statistical properties of polarization field are discussed, and new methods to detect the presence of primordial tensor perturbations are indicated.