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arXiv · 2508.11525

Mackey functors and classical equivariant $K$-theory

Tobias Lenz
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Abstract

We show that the spectral Mackey functors associated to the equivariant algebraic $K$-theory spectra of Guillou-May and Merling (originally constructed using pointset models) can be described purely $\infty$-categorically in terms of the monoidal Borel construction of Barwick-Glasman-Shah and Hilman. We moreover show how P\"utzst\"uck's global version of the Borel construction provides an analogous description of the global spectral Mackey functors arising from Schwede's global algebraic $K$-theory spectra. Our arguments crucially rely on techniques from parametrized higher category theory as well as on structural results on global and equivariant $K$-theory to avoid any explicit computations.

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Tobias Lenz. 2025-08-15. Mackey functors and classical equivariant $K$-theory. https://arxiv.org/abs/2508.11525

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