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Accounting for expansion in $N$-Body gravitational simulations
I have an $N$-Body simulation for the evolution of the universe. It uses a hybrid Tree Particle-Mesh scheme to compute the forces. The tree code used Newtons law of gravity:
$$\textbf{F}_i = -G \sum_{...
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Repulsive forces at large distances
I'm currently writing a 3D $n$-body simulator (similar to what you see here to simulate the evolution of a system of n particles under the force of gravity.
It works fine for "smaller" scale ...
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