# DIMENSIONALITY

In general, there are very many ways of compactifying several extra dimensions. When additional degrees of freedom in string theory are taken into account, compactification may involve several hundred variables, all of which may vary from one region of the universe to another. These variables serve to fix the low-energy physics, by determining what sorts of particles exist, what their masses might be and the nature and strengths of the forces that act between them. The theory also permits compactification to spaces with other than three dimensions. Thus string theory predicts myriad possible low-energy worlds. Some might be quite like ours, but with slightly heavier electrons or a somewhat stronger weak force. Others might differ radically, and possess, say, five large (i.e. uncompactified) space dimensions and two species of photons. DAVIES (2004)

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