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We have investigated non-Gaussianity of our early Universe by comparing theparity asymmetry of the WMAP power spectrum with simulations. We find thatodd-parity preference of the WMAP data (2<= l <=18) is anomalous at 4-in-1000level. We find it likely that low quadrupole power is part of this parityasymmetry rather than an isolated anomaly. Futher investigation is required tofind out whether the origin of this anomaly is cosmological or systematiceffect. The data from Planck surveyor, which has systematics distinct from theWMAP, will help us to resolve the origin of the anomalous odd-paritypreference.

Anomalous parity asymmetry of the Wilkinson Microwave Anisotropy Probe power spectrum data at low multipoles