CMB polarization TE power spectrum estimation with non-circular beam

Understand

Precise measurements of the Cosmic Microwave Background (CMB) anisotropy have been one of the foremost concerns in modern cosmology as it provides valuable information on the cosmology of the universe.

• However, an accurate estimation of the CMB power spectrum faces many challenges as the CMB experiments sensitivity increases.
• Furthermore, for polarization experiments the precision of measurement is complicated by the fact that the polarisation signal is very faint compared to the measured total intensity, and could be impossible to detect in the presence of high level of systematics.
• One of the most important source of errors in CMB polarization experiment is the beam asymmetry.