Coupled double Poisson brackets

Abstract

We introduce coupled double Poisson brackets on an associative algebra $A$ as pairs consisting of a generalized Van den Bergh's double Poisson bracket and a generalized Fairon--McCulloch's right double Poisson bracket subject to a cross-Jacobi identity. Each of Van den Bergh's double brackets, Fairon--McCulloch's right double brackets, and also Ginzburg--Schedler's wheeled Poisson brackets induces a ${\mathrm{GL}}_N$-invariant Poisson structure on the representation scheme ${\mathrm{Rep}}_N(A)$ parametrizing $N$-dimensional representations of $A$, thereby satisfying the Kontsevich--Rosenberg principle. Wheeled Poisson brackets seem to be the most general such structures, and while their relation to Van den Bergh's double Poisson brackets is known, their relation to Fairon--McCulloch's right double Poisson brackets has remained open. We fill this gap and establish a bijection between pairs of coupled double Poisson brackets and wheeled Poisson brackets of Ginzburg and Schedler. On free polynomial algebras, we furthermore establish a one-to-one correspondence between linear coupled double Poisson brackets and a new algebraic structure that we call Poisson-left-pre-Lie algebras, and describe quadratic ones via solutions of the associative and classical Yang--Baxter equations satisfying a compatibility condition.