Making maps of cosmological parameters
  We provide a fast algorithm to diagnose any directional dependence in the
cosmological parameters by calculating maps of local cosmological parameter
estimates and their joint errors. The technique implements a fast quadratic
estimator technique based on Wiener filtering and convolution of the sky with a
patch shape. It uses only three map-resolution spherical harmonic transforms
per parameter and applies to any data set with full sky or a partial sky
coverage. We apply this method to Planck SMICA-2015 and obtain fluctuation map
for six cosmological parameters. Our estimate shows that the Planck data is
consistent with a single global value of the cosmological parameters and is not
influenced by any severe local contaminations. This method is applicable also
to other angular or 3D data sets of future missions to scrutinize any local
variation in the cosmological parameters.
