Cold dark matter haloes in the Planck era: evolution of structural
  parameters for Einasto and NFW profiles
  We present the evolution of the structure of relaxed cold dark matter haloes
in the cosmology from the Planck satellite. Our simulations cover 5 decades in
halo mass, from dwarf galaxies to galaxy clusters. Due to the increased matter
density and power spectrum normalization the concentration mass relation in the
Planck cosmology has a 20 percent higher normalization at redshift z=0 compared
to WMAP cosmology. We confirm that CDM haloes are better described by the
Einasto profile; for example, at scales near galaxy half-light radii CDM haloes
have significantly steeper density profiles than implied by NFW fits. There is
a scatter of 0.2 dex in the Einasto shape parameter at fixed halo mass, adding
further to the diversity of CDM halo profiles. The evolution of the
concentration mass relation in our simulations is not reproduced by any of the
analytic models in the literature. We thus provide a simple fitting formula
that accurately describes the evolution between redshifts z=5 to z=0 for both
NFW and Einasto fits. Finally, the observed concentrations and halo masses of
spiral galaxies, groups and clusters of galaxies at low redshifts are in good
agreement with our simulations, suggesting only mild halo response to galaxy
formation on these scales.
