Abstract
The existence of invariant twisted products (deformations of the associative algebra of C ∞-functions) on the cotangent bundles of classical groups and Stiefel manifolds is proved by explicit constructions. All these products are positive.
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Lichnerowicz, A. Construction of twisted products for cotangent bundles of classical groups and Stiefel manifolds. Lett Math Phys 2, 133–143 (1977). https://doi.org/10.1007/BF00398579
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DOI: https://doi.org/10.1007/BF00398579