Your browser has javascript turned off or blocked. This will lead to some parts of our website to not work properly or at all. Turn on javascript for best performance.

The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

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