Year: 2026
Type: preprint
Abstract: Let $X$ be a smooth projective Poisson surface over an algebraically closed field of characteristic $p>2$, and let $s\in H^0(X,ω_X^{-1})$ be nonzero. We construct an anticanonical section associated to $s$, called the leafrian, on moduli spaces $M$ of stable objects on $X$, including the moduli of stable sheaves, of principal $G$-bundles, and of instantons. The leafrian splits $M$ if and only if $s^{p-1}$ Frobenius splits the base. It is invariant under the Hamiltonian flows of Bottacin's Poisson structure on $M$, so every compatibly split subvariety of $M$ is a Poisson subvariety. Furthermore, the leafrian extends to an anticanonical section on the Gieseker compactification $\bar M$, and splits $\bar M$ under the same criterion. As a consequence, in characteristic zero, for $X$ a smooth projective Poisson surface with a smooth or empty anticanonical divisor and $ρ>0$ (positive leaf rank), the Gieseker compactification $\bar M$ satisfies Kodaira-type cohomology vanishing, including singular $\bar M$.
Source: arXiv (Cornell University)
Author: Peng, Jun
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223353347