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Particle – Mesh algorithmPM algorithm is bad for:• very inhomogeneous distribution of masses• strong correlations, like bound states• complex geometries.In that case use P 3 M or AP 3 M algorithms,tree codes or multipole expansions.105P 3 M algorithmP 3 M = Particle-Particle Particle-MeshSplit the force into a short and a long range part:FlF s F F Fsis small and smooth at short distancesand is calculated using the PM algorithm.is calculated exactly by solving Newton‘sequation.l106
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