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arXiv · 2611.01008

On motivic multiplicativity of cyclic covers

Ze Xu
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Abstract

Let $Y$ be a smooth projective complex variety of dimension $n$ with trivial Chow groups, and let $f: X\rightarrow Y$ be a cyclic cover of degree $d$ branched over a smooth ample divisor $D\in |dL|$. We show that a naturally constructed Chow--Künneth decomposition of $X$ is $m$-fold $mn$-multiplicative for each integer $m\geq2$ and that its stable motivic multiplicativity defect satisfies $\mathfrak{sd}(X)\leq 2dn$. If, in addition, each positive-codimension cycle class on $Y$ is supported on $D$, then a double cover admits motivic $0$-multiplicativity. As a further application, we show that any smooth Gushel--Mukai sixfold admits motivic 0-multiplicativity. Moreover, we establish the sharp modified-diagonal property for all smooth double EPW sextics, confirming a conjecture of O'Grady for these varieties.

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Ze Xu. 2026-10-31. On motivic multiplicativity of cyclic covers. https://arxiv.org/abs/2611.01008

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