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What is the role of smoothed particle hydrodynamics (SPH) in cosmological N-body simulations like the Millenium Run (performed with Gadget-2)?

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Check here Cosmology today-A brief review chapter Thermodynamics in the early Universe, page 10 ... follow the word gas ... some words here would be fine, but, ... find for yourself. – Helder Velez Aug 4 '11 at 22:23

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