Abstract
In this paper we give a complete characterization of Morita equivalent star products on symplectic manifolds in terms of their characteristic classes: two star products $\star$ and $\star'$ on $(M,\omega)$ are Morita equivalent if and only if there exists a symplectomorphism $\psi:M\longrightarrow M$ such that the relative class $t(\star,\psi^*(\star'))$ is $2 \pi \im$-integral. For star products on cotangent bundles, we show that this integrality condition is related to Dirac's quantization condition for magnetic charges.
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