We give an analytic demonstration that the 3+1-dimensional large N SU(N) pure Yang-Mills theory, compactified on a small S-3 so that the coupling constant at the compactification scale is very small, has a first order deconfinement transition as a function of temperature. We do this by explicitly computing the relevant terms in the canonical partition function up to three-loop order; this is necessary because the leading (one-loop) result for the phase transition is precisely on the border line between a first order and a second order transition. Since numerical work strongly suggests that the infinite-volume large N theory also has a first order deconfinement transition, we conjecture that the phase structure is independent of the size of the S-3. To deal with divergences in our calculations, we are led to introduce a novel method of regularization useful for non-Abelian gauge theory on S-3.
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