Topological noetherianity for powers of algebraic representations

Abstract

Powers of a polynomial $\mathrm{GL}$-representation are topologically Noetherian under the action of $\mathrm{Sym}\times \mathrm{GL}$. We extend this result to powers of algebraic representations of the orthogonal and the symplectic groups, proving topological Noetherianity under the action of $\mathrm{Sym}\times O$ and $\mathrm{Sym}\times \mathrm{Sp}$ respectively. This work builds on arXiv:2212.05790 and arXiv:1708.06420, and it provides further evidence that infinite powers of topologically Noetherian varieties remain topologically Noetherian up to permutations.

Comments welcome, updated version has improved clarity and context, 7 pages