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arXiv 2108.02845math.AGmath.NT
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一个半稳定概形的log-动机上同调及其p进变形理论

A log-motivic cohomology for semistable varieties and its $p$-adic deformation theory

Oliver Gregory, Andreas Langer

AI总结:

本文提出了一种半稳定概形的log-动机上同调理论,并探讨了其p进变形理论,通过研究Hyodo-Kato类与Hodge滤波的关系,推广了Bloch-Esnault-Kerz的结论。

摘要:

我们为半稳定概形构造了log-动机上同调群,并研究log-动机上同调类的p进变形理论。我们的主要结果是关于具有半稳定简化的变种的p进变分Hodge猜想的变形部分:一个有理log-动机上同调类在双度数(2n,n)中提升到连续pro类当且仅当其Hyodo-Kato类位于Hodge滤波的第n步中。这推广了Bloch-Esnault-Kerz关于良好简化的结果。在n=1的情况下,提升条件是Yamashita为对数Picard群所获得的条件。在此过程中,我们还将log-动机上同调与对数Milnor K-理论以及对数Hyodo-Kato Hodge-Witt sheaves联系起来。

英文摘要:

We construct log-motivic cohomology groups for semistable varieties and study the $p$-adic deformation theory of log-motivic cohomology classes. Our main result is the deformational part of a $p$-adic variational Hodge conjecture for varieties with semistable reduction: a rational log-motivic cohomology class in bidegree $(2n,n)$ lifts to a continuous pro-class if and only if its Hyodo-Kato class lies in the $n$-th step of the Hodge filtration. This generalises a theorem of Bloch-Esnault-Kerz which treats the good reduction case. In the case $n=1$ the lifting criterion is the one obtained by Yamashita for the logarithmic Picard group. Along the way, we relate log-motivic cohomology to logarithmic Milnor $K$-theory and the logarithmic Hyodo-Kato Hodge-Witt sheaves.

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