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Quantum differentials and the \(q\)-monopole revisited. (English) Zbl 0946.58005

With the rapid growth of the theory of quantum groups which play a role as quantum symmetries, it becomes natural to develop a notion of quantum group gauge theory, i.e. a quantum formulation of differential calculus on principal fibre bundles. In defining a quantum principal bundle, it is natural to replace the base space of a principal bundle by a quantum algebra and replace the group fibres by quantum groups. In noncommutative differential geometry, the available universal differential calculus for a quantum algebra is usually too large to be practically useful, and so a suitably chosen smaller differential calculus becomes important. In this paper, the authors propose a way to construct a non-universal differential calculus on the quantum total space from a ‘horizontal form’ related to the base space and a bicovariant calculus on the quantum group fibre. Then they apply this construction to some examples, including \(q\)-monopole, finite gauge theory, and certain cross product Hopf algebras.

MSC:

58B32 Geometry of quantum groups
81R50 Quantum groups and related algebraic methods applied to problems in quantum theory
16W30 Hopf algebras (associative rings and algebras) (MSC2000)
17B37 Quantum groups (quantized enveloping algebras) and related deformations