Generalized negligible morphisms and their tensor ideals

Thorsten Heidersdorf; Hans Wenzl

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arXiv · 1912.09457

Generalized negligible morphisms and their tensor ideals

Thorsten Heidersdorf·Hans Wenzl

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Abstract

We introduce a generalization of the notion of a negligible morphism and study the associated tensor ideals and thick ideals. These ideals are defined by considering deformations of a given monoidal category $\mathcal{C}$ over a local ring $R$. If the maximal ideal of $R$ is generated by a single element, we show that any thick ideal of $\mathcal{C}$ admits an explicitely given modified trace function. As examples we consider various Deligne categories and the categories of tilting modules for a quantum group at a root of unity and for a semisimple, simply connected algebraic group in prime characteristic. We prove an elementary geometric description of the thick ideals in quantum type A and propose a similar one in the modular case.

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BibTeX RIS

Thorsten Heidersdorf, Hans Wenzl. 2019-12-19. Generalized negligible morphisms and their tensor ideals. https://arxiv.org/abs/1912.09457

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