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Do we have enough mass for a multiverse?



The fact is we don't have an answer for that. The multiverse theory is hard to prove right or wrong simply because those other universes are outside our Universe. So we cannot prove their existence by calculating the mass that exists in the Universe where we live. 

There is also the possibility that those other universes are invisible to us. So we might just guess about the existence of the universes outside our Universe. 

There is a couple of versions of the multiverse theories. The first one is the original multiverse theory where other universes are outside the Universe as we know it. 

But another more exotic version is the matryoshka universe theory. In that theory, the black holes are involving another universe. The idea is that the information cannot vanish. The black hole doesn't destroy information. 

Black holes store information. And that information that is stored in black holes can take the form of the Universe. 

There is the possibility that there are other universes but we cannot see them. The reason for that can be that the size of particles that form those other universes is different than particles in our Universe. So, we cannot see that material. And another version of the invisible Universes is that they exist in black holes. 

But how we can prove that thing? The fact is that we cannot prove that thing without traveling through the event horizon. The idea of that "universe in a black hole" is based on the idea that in the middle of the black hole is the point where all energy and wave motion along with the material is packed. That material would be in the fourth dimension because its energy level is so high. 

Even if we see that the fourth dimension is very small if we are seeing that dimension outside it. But if we want to move into that fourth dimension we can see it as a large space, or similar way as we see the third dimension where we are living. The idea is that the dimension is a certain energy level of the matter. The material must have the same energy level as other material bubbles that can interact with them. 

One of the versions of the matryoshka universe theories is that the Universe is the three-dimensional bubble in spacetime that has an unknown shape. And other three-dimensional bubbles are forming other universes that can interact with "our" Universe. But there is the possibility that there are other universes where the material is four-dimensional. If we will look at those four-dimensional universes from the outside they look small. 

There is the possibility, that part of dark energy could be coming from outside of our Universe. That theory goes like this. The outside energy source brings sends wave motion in "our" Universe. The thing is that the wave motion cannot form from nothingness. So if the source of that wave motion is outside the Universe, it can be in other Universes. But proving those universes' existence is very hard. Maybe gravitational waves can give a tip about the existence of those hypothetical other universes. 


https://en.wikipedia.org/wiki/Multiverse

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