Algebraic K-theory of a torus is naturally equivalent to the Galois-equivariant homology of its character-lattice torus with equivariant K-theory coefficients.
Standard $t$-structures
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abstract
We provide a general construction of induced $t$-structures, that generalizes standard $t$-structures for $\infty$-categories of sheaves. More precisely, given a presentable $\infty$-category $\mathcal{X}$ and a presentable stable $\infty$-category $\mathcal{E}$ equipped with an accessible $t$-structure $\tau = (\mathcal{E}_{\geq 0}, \mathcal{E}_{\leq 0})$, we show that $\mathcal{X} \otimes \mathcal{E}$ is equipped with a canonical $t$-structure whose coconnective part is given in $\mathcal{X} \otimes \mathcal{E}_{\leq 0}$. When $\mathcal{X}$ is an $\infty$-topos, we give a more explicit description of the connective part as well.
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2025 1verdicts
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On the K-theory of algebraic tori
Algebraic K-theory of a torus is naturally equivalent to the Galois-equivariant homology of its character-lattice torus with equivariant K-theory coefficients.