Ostrik's semisimplicity conjecture for quantum doubles

Let g\mathfrak{g} be a semisimple Lie algebra, and let Uq(g)U_q(\mathfrak{g}) be its quantized enveloping algebra with quantum double D(Uq(g))D(U_q(\mathfrak{g})). A finite-dimensional representation is a finite-dimensional left module over this double. Ostrik's semisimplicity conjecture. Every finite-dimensional representation of D(Uq(g))D(U_q(\mathfrak{g})) is semisimple. This was proposed for generic qq in conversations with Victor Ostrik and is described as an open and difficult problem, even for g=sl2\mathfrak{g}=\mathfrak{sl}_2.

Sources & referencesView supporting material

Primary source

John E. Foster, “Semisimplicity of certain representation categories”, arXiv:1509.01633 (2015).

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