We construct θ-deformations of the classical groups SL(2,H) and Sp(2).
Coacting on the basic instanton on a noncommutative four-sphere Sθ4​,
we construct a noncommutative family of instantons of charge 1. The family is
parametrized by the quantum quotient of SLθ​(2,H) by Spθ​(2).Comment: v2: Minor changes; computation of the pairing at the end of Sect. 5.1
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