Poisson Structures and Potentials

TL;DR

This paper introduces weakly log-canonical Poisson structures on positive varieties with potentials, constructs associated integrable systems, and applies the theory to dual Poisson-Lie groups, revealing new geometric and algebraic insights.

Contribution

It defines weakly log-canonical Poisson structures, constructs integrable systems on tropicalized varieties, and applies these concepts to dual Poisson-Lie groups with explicit structures.

Findings

Weakly log-canonical Poisson structures are compatible with positive structures.

An integrable system is constructed on the tropicalization of the variety.

The theory is applied to dual Poisson-Lie groups, revealing explicit geometric structures.

Abstract

We introduce a notion of weakly log-canonical Poisson structures on positive varieties with potentials. Such a Poisson structure is log-canonical up to terms dominated by the potential. To a compatible real form of a weakly log-canonical Poisson variety we assign an integrable system on the product of a certain real convex polyhedral cone (the tropicalization of the variety) and a compact torus. We apply this theory to the dual Poisson-Lie group $G^*$ of a simply-connected semisimple complex Lie group $G$. We define a positive structure and potential on $G^*$ and show that the natural Poisson-Lie structure on $G^*$ is weakly log-canonical with respect to this positive structure and potential. For $K \subset G$ the compact real form, we show that the real form $K^* \subset G^*$ is compatible and prove that the corresponding integrable system is defined on the product of the decorated string cone and the compact torus of dimension $\frac{1}{2}({\rm dim} \, G - {\rm rank} \, G)$.