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I want to ask about the theory of the multiverse system. If the science community feels it exists, how ? If not, what could be the possible boundary of our known universe? and what is the relationship between a multiverse system and quantum mechanics, with emphasis on linear and 3D time frame, random events, etc?
Question Date: 2013-04-08
Answer 1:

Multiverses are predicted by a number of theories of quantum mechanics, particularly those dealing with gravitation. Most of these theories, if I understand them correctly not being a physicist myself, are based on the underlying symmetry of physics within our universe being complimented by the existence of other universes in a multiverse. I think I can confidently say that none of these theories have been tested yet, so what kind of a multiverse, if any, exists, is at the moment purely a subject of conjecture.

The universe that we live in, from what we can tell of it, is infinite: there is no large-scale structure to the cosmos of a sort that would indicate that the universe has a center or an edge. This could mean that the universe really is infinite, or it could mean that the scale of the true structure of the universe is just too large for our limited observations of it to be able to see; because the universe is only 13.7 billion years old, we can only see 13.7 billion light years into space and time, since that's the amount of time that light has had to travel.

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