Non-commutative Duality: High Spin Fields and $CP^1$ Model with Hopf Term

Abstract

We show that the non-commutative $CP^1$ model coupled with Hopf term in 3 dimensions is equivalent to an interacting spin-$s$ theory where the spin $s$ of the dual theory is related to the coefficient of the Hopf term. We use the Seiberg-Witten map in studying this non-commutative duality equivalence, keeping terms to order $θ$ and show that the spin of the dual theory do not get any $θ$ dependant corrections. The map between current correlators show that topological index of the solitons in the non-commutative $CP^1$ model is unaffected by $θ$ where as the Noether charge of the corresponding dual particle do get a $θ$ dependence. We also show that this dual theory smoothly goes to the limit $θ\to 0$ giving dual theory in the commutative plane.