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arXiv · 1812.06441

K\"unneth formulas for motives and additivity of traces

Fangzhou Jin·Enlin Yang
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Abstract

We prove several K\"unneth formulas in motivic homotopy categories and deduce a Verdier pairing in these categories following SGA5, which leads to the characteristic class of a constructible motive, an invariant closely related to the Euler-Poincar\'e characteristic. We prove an additivity property of the Verdier pairing using the language of derivators, following the approach of May and Groth-Ponto-Shulman; using such a result we show that in the presence of a Chow weight structure, the characteristic class for all constructible motives is uniquely characterized by proper covariance, additivity along distinguished triangles, refined Gysin morphisms and Euler classes. In the relative setting, we prove the relative K\"unneth formulas under some transversality conditions, and define the relative characteristic class.

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Fangzhou Jin, Enlin Yang. 2018-12-16. K\"unneth formulas for motives and additivity of traces. https://doi.org/10.1016/j.aim.2020.107446

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