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Chow K\"unneth decomposition for \'etale motives

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arxiv 2403.00159 v1 pith:AG5IZTN4 submitted 2024-02-29 math.AG

classification math.AG
keywords decompositionetaleintegraltextunnethchow-kmotivemotives
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abstract

In the present article we define an integral analogue of Chow-K\"unneth decomposition for \'etale motives. By using families of conservative functors we are able to establish a decomposition of the \'etale motive of commutative group schemes over a base and we relate to an integral \'etale Chow-K\"unneth decomposition of abelian varieties. For a projective variety $X$ of dimension $d$ over an algebraically closed field, we construct integral sub-motives $h^1_{\text{\'et}}(X)$ and $h^{2d-1}_{\text{\'et}}(X)$ of the motive $h_{\text{\'et}}(X)$.

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  1. Deligne 1-motives with torsion and \'etale motives

    math.AG 2025-06 conditional novelty 7.0 of 10

    For Q-schemes and Dedekind schemes, the motivic t-structure exists on 1-motives with integral coefficients, with heart the abelian category of Deligne 1-motives with torsion.

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