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

Hansen, SH, Agertz, O, Joyce, M, Stadel, J, Moore, B and Potter, D (2006) An alternative to grids and glasses: Quaquaversal pre-initial conditions for N-body simulations Astrophys.J., 656. pp. 631-635.

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Abstract

N-body simulations sample their initial conditions on an initial particle distribution, which for cosmological simulations is usually a glass or grid, whilst 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, whilst the glass distribution is poorly defined and computationally expensive to construct. We present a novel particle distribution which 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) ~ k^4), and is trivial to create. It should be particularly useful for warm dark matter and cold collapse simulations.

Item Type: Article
Authors :
AuthorsEmailORCID
Hansen, SHUNSPECIFIEDUNSPECIFIED
Agertz, OUNSPECIFIEDUNSPECIFIED
Joyce, MUNSPECIFIEDUNSPECIFIED
Stadel, JUNSPECIFIEDUNSPECIFIED
Moore, BUNSPECIFIEDUNSPECIFIED
Potter, DUNSPECIFIEDUNSPECIFIED
Date : 7 June 2006
Identification Number : https://doi.org/10.1086/510477
Uncontrolled Keywords : astro-ph, astro-ph
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 15:31
Last Modified : 28 Mar 2017 15:31
URI: http://epubs.surrey.ac.uk/id/eprint/811384

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