The purpose of the simulation is to reproduce the entire evolution of a universe made largely of cold dark matter to see whether it produces same structures that we see in ours--from the galactic structures to galactic clusters, galactic superclusters and beyond.
The most recent theories predict that our universe ought to have structures on the very largest scales called acoustic baryon oscillations. These are essentially the leftovers of waves in the plasma that existed in the very early universe which became frozen in place as they cooled.
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