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In this important simulation, based on a pure baryonic matter model formulated by renowned Princeton cosmologist James Peebles, and performed on a Convex C-240, ordinary matter was modeled in a pure baryonic universe using N Body methods. A so-called N-body problem assumes that each particle in the system exerts a force on all the other particles. If the system has N bodies, then computing the force exerted on each body by all the others requires N times N calculations for each time step.
These techniques can approximate the behavior of the baryonic gas on a supercluster scale but, owing to computational limitations at that time, could not be used to study the details of emergent galaxy clusters. On the plus side, the calculations could be performed in all three spatial dimensions.
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