Power Asymmetry in Planck Full-Mission CMB Temperature Maps

In the cosmological standard model, CMB is expected to show no symmetry preferences. Here we probe the presence of any parity preferences, particularly those of (a)symmetry in power ( $$C_l$$ ) between even and odd multipole of CMB angular power spectrum from the Planck 2015 full-mission CMB data from ESA’s Planck probe. Further we also assess any specific preference for mirror parity asymmetry as well, by comparing the power contained in $$l+m$$ = even or odd mode combinations. In this work we found the odd parity preferences in Planck full-mission data and it is maximally anomalous within the multipole range $$\approx [2,29]$$ .