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This understates parallel universes. To start with, Einstein pointed out that true parallel universes would have to be equivalent to this one. That is, not separated by time, but in coexistence, just with different energy, some of which transcends more than one, like say gravity, but most of which is limited to just their home universe.

But if “dark matter” is really parallel universes, it implies there are only a limited number of them, perhaps a dozen.

This is different from “possible” and “alternate” universes, *or parts thereof*, which are neither permanent or complete.

It is based on a membrane model of the universe, which can be imagined as if our universe was filled with bubbles, and within each are different energy and different rules. Every bit of “matter” is a form of energy made solid and equal to other solids by its surrounding membrane.

In “your” membrane, if you flip a coin, you get heads, and the heads outcome is the “official” outcome. However, the “possible” tails outcome is just as real, as a possibility. So the two outcomes remain real, until you put the coin back in your pocket, when they re-converge. Neither outcome had any real impact beyond that.

However, later in the day you make an “alternative” decision, in this case, you decide if you want to become a US Marine or a ballet dancer. An alternative possibility has outcomes that permanently diverge. Both are just as real, and stay that way. This is like the “endlessly diverging universes” idea, except the entire universe is not involved, just a piece of it.

Yet membranes can permit multiple realities in the same universe. After all, it’s just energy.