Cyclotomic integers, fusion categories, and subfactors

Details Cyclotomic integers, fusion categories, and subfactors Cyclotomic integers, fusion categories, and subfactors

2010-04-05

arxiv.org/abs/1004.0665v1

Communications in Mathematical Physics: Volume 303, Issue 3 (2011), pp. 845-896

Mathematics

Number Theory

47 pages, with an appendix by Victor Ostrik

Scientific paper

10.1007/s00220-010-1136-2

Dimensions of objects in fusion categories are cyclotomic integers, hence number theoretic results have implications in the study of fusion categories and finite depth subfactors. We give two such applications. The first application is determining a complete list of numbers in the interval (2, 76/33) which can occur as the Frobenius-Perron dimension of an object in a fusion category. The smallest number on this list is realized in a new fusion category which is constructed in the appendix written by V. Ostrik, while the others are all realized by known examples. The second application proves that in any family of graphs obtained by adding a 2-valent tree to a fixed graph, either only finitely many graphs are principal graphs of subfactors or the family consists of the A_n or D_n Dynkin diagrams. This result is effective, and we apply it to several families arising in the classification of subfactors of index less then 5.

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