twin universe cosmology
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...The large-scale structure arises from the phenomenon of joint gravitational instabilities. However, the densities r and r* are very different. We can revisit the model mentioned earlier (the heavy balls on top, and the ping-pong balls below). It would suffice to imagine the ping-pong balls being larger and the heavy balls reduced to simple lead shot. We would then obtain this:
The model describing the outcome of the process.
The ping-pong balls have aggregated, forming bumps,
while the lead shot have been pushed into the "valleys"
away from these protrusions.
...Note in passing that we could also consider the reverse situation, where it is the ping-pong balls that adopt a nearly uniform distribution—this would be the case if they were sufficiently agitated laterally (in a hot environment). In this case, the ordinary matter, being cooler, could then accumulate in a depression. We would then obtain a model resembling the confinement of galaxies, arising from their cold ghost matter environment:
**Model intended to illustrate