Quantum Toroidal Comodule Algebra of Type $A_{n-1}$ and Integrals of Motion

Abstract: We introduce an algebra $\mathcal{K}n$ which has a structure of a left comodule over the quantum toroidal algebra of type $A{n-1}$. Algebra $\mathcal{K}_n$ is a higher rank generalization of $\mathcal{K}_1$, which provides a uniform description of deformed $W$ algebras associated with Lie (super)algebras of types BCD. We show that $\mathcal{K}_n$ possesses a family of commutative subalgebras.