Remapping dark matter halo catalogues between cosmological simulations
  We present and test a method for modifying the catalogue of dark matter
haloes produced from a given cosmological simulation, so that it resembles the
result of a simulation with an entirely different set of parameters. This
extends the method of Angulo & White (2010), which rescales the full particle
distribution from a simulation. Working directly with the halo catalogue offers
an advantage in speed, and also allows modifications of the internal structure
of the haloes to account for nonlinear differences between cosmologies. Our
method can be used directly on a halo catalogue in a self contained manner
without any additional information about the overall density field: although
the large-scale displacement field is required by the method, this can be
inferred from the halo catalogue alone. We show proof of concept of our method
by rescaling a matter-only simulation with no baryon acoustic oscillation (BAO)
features to a more standard LCDM model containing a cosmological constant and a
BAO signal. In conjunction with the halo occupation approach, this method
provides a basis for the rapid generation of mock galaxy samples spanning a
wide range of cosmological parameters.
