# The monoidal center and the character algebra

20 被引用数 (Scopus)

## 抄録

For a pivotal finite tensor category C over an algebraically closed field k, we define the algebra CF(C) of class functions and the internal character ch(X)∈CF(C) for an object X∈C by using an adjunction between C and its monoidal center Z(C). We also develop the theory of integrals and the Fourier transform in a unimodular finite tensor category by using the same adjunction. Our main result is that the map ch:Grk(C)→CF(C) given by taking the internal character is a well-defined injective homomorphism of k-algebras, where Grk(C) is the scalar extension of the Grothendieck ring of C to k. Moreover, under the assumption that C is unimodular, the map ch is an isomorphism if and only if C is semisimple. As an application, we show that the algebra Grk(C) is semisimple if C is a non-degenerate pivotal fusion category. If, moreover, Grk(C) is commutative, then we define the character table of C based on the integral theory. It turns out that the character table is obtained from the S-matrix if C is a modular tensor category. Generalizing corresponding results in the finite group theory, we prove the orthogonality relations and the integrality of the character table.

本文言語 English 2338-2371 34 Journal of Pure and Applied Algebra 221 9 https://doi.org/10.1016/j.jpaa.2016.12.037 Published - 2017 9月 1

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