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arXiv 0905.3117math.QA
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分级融合分类中心

Centers of graded fusion categories

Shlomo Gelaki, Deepak Naidu, Dmitri Nikshych

摘要:

设C是被有限群G忠实分次的融合范畴,D是该分次的平凡分支.证明了C的中心Z(C)正则等价于相对中心Z_D(C)的G-等变分。我们使用这个结果来获得一个标准C是群论的,并将其应用到Tambara Yamagami融合类别。通过分析Tambara-Yamagami范畴的中心,我们还发现了几个新的模范畴系列。最后,我们证明了弱整模范畴S-矩阵零点存在性的一个一般结果。

英文摘要:

Let C be a fusion category faithfully graded by a finite group G and let D be the trivial component of this grading. The center Z(C) of C is shown to be canonically equivalent to a G-equivariantization of the relative center Z_D(C). We use this result to obtain a criterion for C to be group-theoretical and apply it to Tambara-Yamagami fusion categories. We also find several new series of modular categories by analyzing the centers of Tambara-Yamagami categories. Finally, we prove a general result about existence of zeroes in S-matrices of weakly integral modular categories.

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