Research output: Working paper › Research

- 1910
Final published version, 335 KB, PDF document

- https://arxiv.org/abs/1910.08758v1
Submitted manuscript

- Andrea Di Lorenzo

We compute the integral Picard group of the stack $\mathcal{K}_{2l}$ of quasi-polarized K3 surfaces of degree $2l=4,6,8$. We show that in this range the integral Picard group is torsion-free and that a basis is given by certain elliptic Noether-Lefschetz divisors together with the Hodge line bundle. To achieve this result, we investigate certain stacks of complete intersections and their Picard groups by means of equivariant geometry. In the end we compute an expression of the class of some Noether-Lefschetz divisors, restricted to an open substack of $\mathcal{K}_{2l}$, in terms of the basis mentioned above.

Original language | English |
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Publisher | ArXiv |

Publication status | Published - 19 Oct 2019 |

24 pages

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ID: 176967005