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Balmer spectra and Drinfeld centers

Kent B. Vashaw

Vol. 18 (2024), No. 6, 1081–1116

The Balmer spectrum of a monoidal triangulated category is an important geometric construction which is closely related to the problem of classifying thick tensor ideals. We prove that the forgetful functor from the Drinfeld center of a finite tensor category C to C extends to a monoidal triangulated functor between their corresponding stable categories, and induces a continuous map between their Balmer spectra. We give conditions under which it is injective, surjective, or a homeomorphism. We apply this general theory to prove that Balmer spectra associated to finite-dimensional cosemisimple quasitriangular Hopf algebras (in particular, group algebras in characteristic dividing the order of the group) coincide with the Balmer spectra associated to their Drinfeld doubles, and that the thick ideals of both categories are in bijection. An analogous theorem is proven for certain Benson–Witherspoon smash coproduct Hopf algebras, which are not quasitriangular in general.

Hopf algebra, stable module category, tensor triangulated category, thick ideal
Mathematical Subject Classification
Primary: 16T05, 18G65, 18G80, 18M05, 18M15
Received: 1 December 2021
Revised: 5 June 2023
Accepted: 3 September 2023
Published: 30 April 2024
Kent B. Vashaw
Department of Mathematics
Massachusetts Institute of Technology
Cambridge, MA
United States

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