Decomposing the Tube Category

Leonard Hardiman, Alastair King

Research output: Contribution to journalArticlepeer-review


The tube category of a modular tensor category is a variant of the tube algebra, first introduced by Ocneanu. As a category, it can be decomposed in two different, but related, senses. Firstly, via the Yoneda embedding, the Hom spaces decompose into summands factoring though irreducible functors, in a manner analogous to decomposing an algebra as a sum of matrix algebras. We describe these summands. Secondly, under the Yoneda embedding, each object decomposes into irreducibles, which correspond to primitive idempotents in the category itself. We identify these idempotents. We make extensive use of diagram calculus in the description and proof of these decompositions.
Original languageEnglish
Number of pages18
JournalGlasgow Mathematical Journal
Early online date17 Jun 2019
Publication statusE-pub ahead of print - 17 Jun 2019


  • monoidal categories
  • modular tensor categories

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