I've been wondering. If multiple universes exist, how could they interact and how we could make and simplified projection of this multiverse? One common idea here on the forum has been that when our universe expands it might someday merge with another one. This would mean that all the universes would exist in the same three-dimensional space.
But maybe it is impossible for universes to merge. Let's consider that our universe would be two-dimensional. A fictional observer from three-dimensional world would see us then as a flat layer. If there would be another universe, it would (from the three-dimensional observer point of view) be a layer under or top of our own. These layers could expand infinitely and never get in touch with each other. Only way for these layers then to interact with each other would be through the third dimension which exists all the time everywhere but cannot be seen.
Of course gravity and black holes might "suck" the layers towards each others but it is hard to figure out how dense 2d objects could draw the whole stucture. And one big question then would be, would they suck it towards the layer which is above or under.
By the way, the nature of 3rd dimension would be very hard to understand for the fictional 2d people. Maybe they would try to make a simplified one-dimensional projection of their own world?
But maybe it is impossible for universes to merge. Let's consider that our universe would be two-dimensional. A fictional observer from three-dimensional world would see us then as a flat layer. If there would be another universe, it would (from the three-dimensional observer point of view) be a layer under or top of our own. These layers could expand infinitely and never get in touch with each other. Only way for these layers then to interact with each other would be through the third dimension which exists all the time everywhere but cannot be seen.
Of course gravity and black holes might "suck" the layers towards each others but it is hard to figure out how dense 2d objects could draw the whole stucture. And one big question then would be, would they suck it towards the layer which is above or under.
By the way, the nature of 3rd dimension would be very hard to understand for the fictional 2d people. Maybe they would try to make a simplified one-dimensional projection of their own world?
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