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Originally Posted by Kristian
I like the idea that we could communicate with parallel universes by something akin to a phone!
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String Theory allows for multiple dimensions (the basis of Universe Parallelism speculation) as follows:
(Super) String theory offers a possible unified theory of all fundamental forces, but requires a 10 dimensional spacetime, or else bad quantum states called "ghosts" with un-physical, negative probabilities become part of the spectrum.
This creates a problem in d=10 string theory: how to get the d=4 world as we know it OUT of the theory.
So far there are two main proposals:
1. Roll up the extra dimensions into some very tiny, but nevertheless extremely interesting, space of their own. This is called Kaluza Klein compactification.
2. Make the extra dimensions really big, but constrain all the matter and gravity to propagate in a three dimensional subspace called the three brane.
(For an analogy, your computer screen could be said to be a two brane of three dimensional space.) These types of theories are called braneworlds.
(Super) String Theory Specialists are sometimes called "mediums" -- see my point?
j-