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How to Simulate the Universe in a Computer
Knebe, Alexander
AA(Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia; Astrophysikalisches Institut Potsdam (AIP), 14482 Postdam, Germany )
Publications of the Astronomical Society of Australia, Volume 22, Issue 3, pp. 184-189. (PASA Homepage)
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cosmology: theory, cosmology: dark matter, methods: N-body simulations, methods: numerical
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In this contribution a broad overview of the methodologies of cosmological N-body simulations and a short introduction explaining the general idea behind such simulations is presented. After explaining how to set up the initial conditions using a set of N particles two (diverse) techniques are presented for evolving these particles forward in time under the influence of their self-gravity. One technique (tree codes) is solely based upon a sophistication of the direct particle-particle summation whereas the other method relies on the continuous (de-)construction of arbitrarily shaped grids and is realized in adaptive mesh refinement codes.
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