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Oscar Agertz. Profile photo.

Oscar Agertz

Assistant Professor / Associate senior university lecturer / Wallenberg Academy Fellow

Oscar Agertz. Profile photo.

An alternative to grids and glasses : Quaquaversal pre-initial conditions for N-body simulations

Author

  • Steen H. Hansen
  • Oscar Agertz
  • Michael Joyce
  • Joachim Stadel
  • Ben Moore
  • Doug Potter

Summary, in English

N-body simulations sample their initial conditions on an initial particle distribution, which for cosmological simulations is usually a glass or grid, while a Poisson distribution is used for galaxy models, spherical collapse, etc. These pre-initial conditions have inherent correlations, noise due to discreteness, and preferential alignments, while the glass distribution is poorly defined and computationally expensive to construct. We present a novel particle distribution that can be useful as a pre-initial condition for N-body simulations, using a simple construction based on a "quaquaversal" tiling of space. This distribution has little preferred orientation (i.e., is statistically isotropic), has a rapidly vanishing large-scale power spectrum [P(k) ∼ k4], and is trivial to create. It should be particularly useful for warm dark matter and cold collapse simulations.

Publishing year

2007-02-20

Language

English

Pages

631-635

Publication/Series

Astrophysical Journal

Volume

656

Issue

2 I

Document type

Journal article

Publisher

American Astronomical Society

Keywords

  • Methods: N-body simulations

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X