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arxiv: 1512.04288 · v2 · pith:FCQ3RGYKnew · submitted 2015-12-14 · 🧮 math.OA · math.CT· math.QA· math.RT

A Cuntz algebra approach to the classification of near-group categories

classification 🧮 math.OA math.CTmath.QAmath.RT
keywords categoriesnear-groupalgebracasesclassificationclassifycuntzirrational
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We classify C$^*$ near-group categories by using Vaughan Jones theory of subfactors and the Cuntz algebra endomorphisms. Our results show that there is a sharp contrast between two essentially different cases, integral and irrational cases. When the dimension of the unique non-invertible object is an integer, we obtain a complete classification list, and it turns out that such categories are always group theoretical. When it is irrational, we obtain explicit polynomial equations whose solutions completely classify the C$^*$ near-group categories in this class.

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