Parity In Planck Full-Mission Cmb Temperature Maps

In the standard model of cosmology, Cosmic Microwave Background (CMB) sky is expected to preserve spatial symmetries. Following our previous studies, we search for evidence of a parity preference in the latest full-mission CMB temperature maps from ESA's Planck probe. Specifically, we probe (a)symmetry in power between even and odd multipoles of CMB, that corresponds to a particular parity preference under inversion, in Planck 2015 angular power spectrum measurements. We also assess any specific preference for mirror parity (a)symmetry, by analysing the power contained in l + m=even or odd mode combinations. (C) 2020 Published by Elsevier B.V.