English

The Lagrangian flux-monodromy morphism

Symplectic Geometry 2026-07-15 v1

Abstract

We define a new morphism on the fundamental group of the space of Lagrangian submanifolds, which takes into account the Lagrangian flux and monodromy. We study the discreteness of its image and relate this discreteness to the (CC^\infty) topology of the Hamiltonian orbit of the Lagrangian in question. We completely describe this new morphism for Lagrangian tori in R4\mathbb{R}^4 and CP2\mathbb{C}P^2 and give explicit constructions. Similar constructions allow us to study the shape invariant of the Clifford torus in CPn\mathbb{C}P^n. Finally, we upgrade our results on Lagrangian tori in R4\mathbb{R}^4 from the CC^\infty topology to the Hausdorff one.

Keywords

Cite

@article{arxiv.2607.13900,
  title  = {The Lagrangian flux-monodromy morphism},
  author = {Joé Brendel and Jean-Philippe Chassé and Rémi Leclercq},
  journal= {arXiv preprint arXiv:2607.13900},
  year   = {2026}
}

Comments

63 pages, 5 figures, 1 table