S-duality from OM-theory

We study the compactification of OM-theory on tori and show a simple heuristic derivation of the S-duals of noncommutative open string theory in diverse dimensions from the OM-theoretical point of view. In particular, we identify the S-duality between noncommutative open string theory and noncommutative Yang–Mills theory in 3+1 dimensions as the exchange of two circles of a torus on which OM-theory is compactified. Also, we briefly discuss T-duality between noncommutative open string theories.