Remapping dark matter halo catalogues between cosmological simulations

J. A. Peacock, Alexander Mead

Research output: Contribution to journalArticlepeer-review

Abstract

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, 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 non-linear 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 Lambda cold dark matter 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.
Original languageEnglish
Pages (from-to)1233-1247
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume440
Issue number2
DOIs
Publication statusPublished - 1 May 2014

Keywords

  • cosmology: theory
  • large-scale structure of Universe

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