Integrable dynamics in projective geometry via dimers and triple crossing diagram maps on the cylinder

Niklas Affolter (1, 2) , Terrence George (3) , Sanjay Ramassamy (4, 5, 6, 7)

1 Institut für Mathematik [Berlin]
2 DMA - Département de Mathématiques et Applications - ENS Paris
3 Department of Mathematics - University of Michigan
4 Université Paris-Saclay
5 CNRS - Centre National de la Recherche Scientifique
6 CEA - CEA- Saclay
7 IPHT - Institut de Physique Théorique - UMR CNRS 3681

We introduce twisted triple crossing diagram maps, collections of points in projective space associated to bipartite graphs on the cylinder, and use them to provide geometric realizations of the cluster integrable systems of Goncharov and Kenyon constructed from toric dimer models. Using this notion, we provide geometric proofs that the pentagram map and the cross-ratio dynamics integrable systems are cluster integrable systems. We show that in appropriate coordinates, cross-ratio dynamics is described by geometric R-matrices, which solves the open question of finding a cluster algebra structure describing cross-ratio dynamics.

Domaines: Systèmes Solubles et Intégrables [nlin.SI]; Combinatoire [math.CO]; Géométrie différentielle [math.DG]; Systèmes dynamiques [math.DS]

Niklas Affolter, Terrence George, Sanjay Ramassamy. Integrable dynamics in projective geometry via dimers and triple crossing diagram maps on the cylinder. 2023. ⟨hal-03364744v2⟩