Parallel Universe, 10 dimensions.... Parallel Universes, 10 dimensions and more. This is a theory (more like hypothetical situation really) I came up with the other day as I was thinking about the 10 (or 26) dimensions predicted by string theory as well as antimatter, thermodynamics and the Big Crunch. This may be a little unordered (in accordance with the 2nd Law of Thermodynamics- sorry couldn’t resist it), so bear with me. We know that string theory predicts the existence of 10 dimensions, viz. 3 spatial and one time dimension. Also it is predicted that the other six dimensions are curved up into a very small space, unlike the other four dimensions which flattened out (presumably sometime near the Big Bang). Now what if those six other dimensions, did not curl up? Let’s suppose you get two kinds of dimensions: macro dimensions and micro dimensions. Now as the name implies, the macro dimensions would be larger than the micro dimensions. The macro dimensions would act as ‘container’ or ‘housing’ dimensions for the micro dimensions. Imagine a big bubble containing smaller bubbles, the big bubble would be the macro dimension and the smaller bubbles would be the micro dimensions. Now suppose we have two macro dimensions, each containing three spatial and one time dimension, giving a total of ten dimensions. Consider the first macro dimension. This is the one in which we exist and which all laws of science were formulated. The second macro dimension would be the dimension containing most of the antiparticles and antimatter in the universe. I say most, because we have observed, in very minute quantities, antimatter in our macro dimension. This could account for the apparent lack of (observable) antimatter in the universe. Also in the antiparticle macro dimensions, the strings that make up the fundamental particles could be seen as vibrating in the opposite manner as those in our dimension. From wave theory we know that these waves would cancel each other out if they are superimposed. However I cannot account for the resultant release in energy which occurs (I’m still trying to figure that out). Now imagine a couple of thousand million years into the future, the rate of expansion of the universe drops below the critical rate and the universe starts to contract. Now it might be said that this would not be in accordance to the 2nd law of thermodynamics. If you considered the macro dimension theory, it would be more feasible (notice how I don’t say possible – I’m already too far out on a limb to go further). As the universe contracts, the two macro dimensions would move closer together, resulting in a more ordered state and thus decreasing entropy. However, as the distance between the two macro dimensions decrease, more particle-antiparticle annihilation reactions would take place, giving off more and more energy. This increase entropy would be greater than the decrease caused by macro dimensions coming closer together. Eventually, a Big Crunch would result. Consider this, black holes may be seen as gateways between the macro dimensions. Although, you’d probably never survive the trip and if you do, you’d most likely be annihilated by your antiparticle-self. As we can see, in both these cases the 2nd law of thermodynamics would also hold. One question that jumped into my mind as I came up with this is: “If there are two macro dimensions, what’s to say there isn’t another super dimension, in which the macro dimensions are contained??” Well, some scientists are working on the possibility that an 11th dimensions exists, which can be used as the super dimension. I know this theory may be filled with gaps and/or errors. I haven’t even yet considered CPT-symmetry, although I’m quite sure it would not fit in here. The above theory may however be modified to allow for CPT-symmetry to hold (possibly). One last thing before I get flamed to death. I’m only a second year student. So most of what I know of cosmology and string theory was learnt from reading in my spare time. Nietsnie PS: I'm suppose to be studying for a physics test, so hopefully this wasn't a complete waste of time.