1306.0955 (W. Zhao)

Directional dependence of CMB parity asymmetry    [PDF]

W. Zhao

Parity violation in the Cosmic Microwave Background (CMB) radiation has been confirmed by the recent Planck observation. In this paper, we extend the previous work [P. Naselsky et al. Astrophys. J. {\bf 749}, 31 (2012)] on the directional properties of CMB parity asymmetry by considering the Planck data of CMB temperature anisotropy. We define six kinds of the directional statistics, and find that they all indicate the odd-parity preference of CMB data. In addition, we find the preferred axes of all these statistics strongly correlate with the preferred axes of CMB kinematic dipole, quadrupole and octopole, and confirm the alignment between them at more than $3\sigma$ confidence level, which implies that the CMB parity asymmetry, and the anomalies of CMB quadrupole and octopole may have the common physical, contaminated or systematic origin.

View original: http://arxiv.org/abs/1306.0955