Fadeev and Niemi have proposed a decomposition of SU(N) Yang-Mills theory in terms of new variables, appropriate for describing the theory in the infrared limit. We extend this method to SO(2N) Yang-Mills theory. We find that the SO(2N) connection decomposes according to irreducible representations of OS(N). The low-energy limit of the decomposed theory is expected to describe solitonlike configurations with nontrivial topological numbers. How the method of decomposition generalizes for SO(2N + 1) Yang-Mills theory is also discussed.
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