arXiv subjects

Jonas Baltes

Publications and source records attributed to Jonas Baltes.

3 recordsLinked to original sources

arXiv2024

Hilbert Schemes and Seshadri Constants

In this paper we will propose a new method to investigate Seshadri constants, namely by means of (nested) Hilbert schemes. This will allow us to use the geometry of the latter spaces, for example the computations of the nef cone via Bridgeland stability conditions to gain new insights and bounds on Seshadri constants. Moreover, it turns out that many known Seshadri constants turn up in the wall and chamber decomposition of the movable cone of Hilbert schemes.

math.AG↗

arXiv2023

Lefschetz-type theorems for the effective cone on Hyperk\"ahler varieties

In this paper we show some Lefschetz-type theorems for the effective cone of Hyperk\"ahler varieties. In particular we are able to show that the inclusion of any smooth ample divisor induces an isomorphism of effective cones. Moreover we deduce a similar statement for some effective exceptional divisors, which yields the computation of the effective cone of e.g. projectivized cotangent bundles and some projectivized Lazarsfeld--Mukai bundles.

math.AG↗

arXiv2021

Singular Rational Curves on Elliptic K3 Surfaces

We show that on every elliptic K3 surface $X$ there are rational curves $(R_i)_{i\in \mathbb{N}}$ such that $R_i^2 \to \infty$, i.e., of unbounded arithmetic genus. Moreover, we show that the union of the lifts of these curves to $\mathbb{P}(Ω_X)$ is dense in the Zariski topology. As an application we give a simple proof of a theorem of Kobayashi in the elliptic case, i.e., there are no globally defined symmetric differential forms.

math.AG↗