Cross Product Quantisation, Nonabelian Cohomology And Twisting Of Hopf Algebras

Details Cross Product Quantisation, Nonabelian Cohomology And Twisting Of Hopf Algebras Cross Product Quantisation, Nonabelian Cohomology And Twisting Of Hopf Algebras

1993-11-30

arxiv.org/abs/hep-th/9311184v1

Physics

High Energy Physics

High Energy Physics - Theory

26 pages

Scientific paper

This is an introduction to work on the generalisation to quantum groups of Mackey's approach to quantisation on homogeneous spaces. We recall the bicrossproduct models of the author, which generalise the quantum double. We describe the general extension theory of Hopf algebras and the nonAbelian cohomology spaces $\CH^2(H,A)$ which classify them. They form a new kind of topological quantum number in physics which is visible only in the quantum world. These same cross product quantisations can also be viewed as trivial quantum principal bundles in quantum group gauge theory. We also relate this nonAbelian cohomology $\CH^2(H,\C )$ to Drinfeld's theory of twisting.

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