Probing cosmological isotropy with Planck Sunyaev-Zeldovich galaxy
  clusters
  We probe the statistical isotropy hypothesis of the large-scale structure
with the second Planck Sunyaev-Zeldovich (PSZ2) galaxy clusters data set. Our
analysis adopts a statistical-geometrical method which compares the 2-point
angular correlation function of objects in antipodal patches of the sky. Given
possible observational biases, such as the presence of anisotropic sky cuts and
the non-uniform exposure of Planck's instrumentation, ensembles of Monte Carlo
realisations are produced in order to assess the significance of our results.
When these observational effects are properly taken into account, we find
neither evidence for preferred directions in the sky nor signs of large-angle
features in the galaxy clusters celestial distribution. The PSZ2 data set is,
therefore, in good concordance with the fundamental hypothesis of large-angle
isotropy of cosmic objects.
