New constraints on Parity Symmetry from a re-analysis of the WMAP-7 low
  resolution power spectra
  The Parity symmetry of the Cosmic Microwave Background (CMB) pattern as seen
by WMAP 7 is tested jointly in temperature and polarization at large angular
scale. A Quadratic Maximum Likelihood (QML) estimator is applied to the WMAP 7
year low resolution maps to compute all polarized CMB angular power spectra.
The analysis is supported by 10000 realistic Monte-Carlo realizations. We
confirm the previously reported Parity anomaly for TT in the range $\delta
\ell=[2,22]$ at $> 99.5%$ C.L.. No anomalies have been detected in TT for a
wider $\ell$ range (up to $\ell_{max}=40$). No violations have been found for
EE, TE and BB which we test here for the first time. The cross-spectra TB and
EB are found to be consistent with zero. We also forecast {\sc Planck}
capabilities in probing Parity violations on low resolution maps.
