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The stable module category and model structures for hierarchically defined groups

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abstract

In this work we construct a compactly generated tensor-triangulated stable category for a large class of infinite groups, including those in Kropholler's hierarchy $\mathrm{LH}\mathfrak{F}$. This can be constructed as the homotopy category of a certain model category structure, which we show is Quillen equivalent to several other model categories, including those constructed by Bravo, Gillespie, and Hovey in their work on stable module categories for general rings. We also investigate the compact objects in this category. In particular, we give a characterisation of those groups of finite global Gorenstein AC-projective dimension such that the trivial representation $\mathbb{Z}$ is compact.

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math.RT 1

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2025 1

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Total acyclicity of complexes over group algebras

math.RT · 2025-05-16 · accept · novelty 6.0

The authors define a class of groups for which Gorenstein projective, flat, and injective modules over the group algebra behave as their classical counterparts, and prove this class is closed under Kropholler's LH and Talelli's Phi operations.

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  • Total acyclicity of complexes over group algebras math.RT · 2025-05-16 · accept · none · ref 30 · internal anchor

    The authors define a class of groups for which Gorenstein projective, flat, and injective modules over the group algebra behave as their classical counterparts, and prove this class is closed under Kropholler's LH and Talelli's Phi operations.