# Could six copies of the universe exist only interacting by gravity? [closed]

The ratio of dark matter to matter is roughly in proportions $$1:5.4$$

This suggests that if there were about 6 Universes placed in the same space that were completely invisible to each other, except for the gravitational force, then this is what we would expect.

Some people have said that some of the dark matter could be made of "mirror matter". But if mirror matter had the same mass and particles this would not add up. But if there were another 3-fold symmetry perhaps there could be 6 types of matter. Each type only interacting with itself.

The funny thing about these 6 Universes is that their galaxies would all roughly be in the same place. So each galaxy would in fact be 6 overlapping galaxies. (Perhaps in a nice symmetrical arrangement). (Would they all spin in the same direction?)

In each of the 6 overlapping Universes there might be lifeforms that we would never see.

So if each particle that we know of actually came in 6 types and particles could only interact with similar types then this would have to be true.

Is this possible to prove or disprove?

(I would think that in the center of the galaxy, where all 6 galaxy centers coincide there would be more gravitational interaction between "dark stars". Whereas near the arms if the 6 galaxies are not lines up there would be less interaction. Assuming galaxies are disc shapes in all 6 univereses)

Edit: Some people have pointed out that dark matter interacts less strongly. But if each of the 5 dark Universes don't interact with other 4 dark Universes, only themselves, it would mean the dark matter in total would interact precisely on fifth or $$20\%$$ with itself on average.

## closed as off-topic by StephenG, G. Smith, Jon Custer, Qmechanic♦Apr 23 at 5:06

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• It's not that simple. For starters, the measured distribution of dark matter isn't just 5x the regular matter distribution, or even approximately 5x. It has a different shape entirely. Furthermore, if you want structure formation to work out right, dark matter can't interact with itself as strongly as normal matter does. – knzhou Apr 22 at 19:51
• @zooby, what about the 0.4 universe you left out? This is sheer discrimination against mass-challenged universe. – MadMax Apr 22 at 19:55
• @Madmax Yeah, I was hoping people wouldn't notice! Maybe they didn't measure it right? It's a possibility. – zooby Apr 22 at 20:09
• @knzhou but if you think about it each one of the 5 dark universes wouldn't interact with another of the 5 dark universes so overall the dark universes only interact 1/5th with "itself" in total. – zooby Apr 22 at 20:11