Big Algebra in Type $A$ for the Coordinate Ring of the Matrix Space

In this paper, we consider the big algebra recently introduced by Hausel for the ${\mathrm{G}\mathrm{L}}_n$-action on the coordinate ring of the matrix space $\mathrm{M}\mathrm{a}\mathrm{t}(n,r)$. In particular, we obtain explicit formulas for the big algebra generators in terms of differential operators with polynomial coefficients. We show that big algebras in type $A$ are commutative and relate them to the Bethe subalgebra in the Yangian $\mathrm{Y}({\mathfrak{g}\mathfrak{l}}_n)$. We apply these results to big algebras of symmetric powers of the standard representation of ${\mathrm{G}\mathrm{L}}_n$.