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RELATIVE CYCLES WITH MODULI AND REGULATOR MAPS
Published online by Cambridge University Press: 02 November 2017
Abstract
Let $\overline{X}$ be a separated scheme of finite type over a field
$k$ and
$D$ a non-reduced effective Cartier divisor on it. We attach to the pair
$(\overline{X},D)$ a cycle complex with modulus, those homotopy groups – called higher Chow groups with modulus – generalize additive higher Chow groups of Bloch–Esnault, Rülling, Park and Krishna–Levine, and that sheafified on
$\overline{X}_{\text{Zar}}$ gives a candidate definition for a relative motivic complex of the pair, that we compute in weight
$1$. When
$\overline{X}$ is smooth over
$k$ and
$D$ is such that
$D_{\text{red}}$ is a normal crossing divisor, we construct a fundamental class in the cohomology of relative differentials for a cycle satisfying the modulus condition, refining El Zein’s explicit construction of the fundamental class of a cycle. This is used to define a natural regulator map from the relative motivic complex of
$(\overline{X},D)$ to the relative de Rham complex. When
$\overline{X}$ is defined over
$\mathbb{C}$, the same method leads to the construction of a regulator map to a relative version of Deligne cohomology, generalizing Bloch’s regulator from higher Chow groups. Finally, when
$\overline{X}$ is moreover connected and proper over
$\mathbb{C}$, we use relative Deligne cohomology to define relative intermediate Jacobians with modulus
$J_{\overline{X}|D}^{r}$ of the pair
$(\overline{X},D)$. For
$r=\dim \overline{X}$, we show that
$J_{\overline{X}|D}^{r}$ is the universal regular quotient of the Chow group of
$0$-cycles with modulus.
Keywords
- Type
- Research Article
- Information
- Journal of the Institute of Mathematics of Jussieu , Volume 18 , Issue 6 , November 2019 , pp. 1233 - 1293
- Copyright
- © Cambridge University Press 2017
References
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