K\"ahler complexity one Hamiltonian $T$-manifolds have trivial paintings
Abstract
Let a torus act on a symplectic manifold with moment map . We say that the Hamiltonian -manifold has complexity one if , and that it is K\"ahler if it admits an invariant compatible complex structure. In this paper, we show how the class of K\"ahler complexity one Hamiltonian -manifolds sits inside the class of complexity one Hamiltonian -manifolds by proving that every compact, connected K\"ahler complexity one Hamiltonian -manifold has a trivial painting. As a corollary, we show that two tall compact, connected K\"ahler complexity one Hamiltonian -manifolds are symplectomorphic exactly if they have the same genus, Duistermaat-Heckman measure, and skeleton. Here, is tall exactly if every non-empty fiber contains more than one orbit.
Cite
@article{arxiv.2603.12404,
title = {K\"ahler complexity one Hamiltonian $T$-manifolds have trivial paintings},
author = {Isabelle Charton and Liat Kessler and Susan Tolman},
journal= {arXiv preprint arXiv:2603.12404},
year = {2026}
}
Comments
15 pages