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

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dc.creatorHansen, Steen H.
dc.creatorAgertz, Oscar
dc.creatorJoyce, Michael
dc.creatorStadel, Joachim
dc.creatorMoore, Ben
dc.creatorPotter, Doug
dc.date2006-06-07
dc.date2006-12-19
dc.date.accessioned2026-07-07T10:39:14Z
dc.date.available2026-07-07T10:39:14Z
dc.descriptionN-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.
dc.description8 pages, 6 figures, extended discussion of level of isotropy, matches version accepted in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606148
dc.identifierhttp://arxiv.org/abs/astro-ph/0606148
dc.identifierAstrophys.J.656:631-635,2007
dc.identifierdoi:10.1086/510477
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180955
dc.subjectAstrophysics
dc.titleAn alternative to grids and glasses: Quaquaversal pre-initial conditions for N-body simulations
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