Quantum Stiefel manifolds

Abstract

Quantum analogs of Stiefel manifolds $S{U}_q(n)/S{U}_q(n-m)$ were introduced by Podkolzin \& Vainerman. The underlying $C^{\ast }$-algebra $C(S{U}_q(n)/S{U}_q(n-m))$ can be described as the $C^{\ast }$-subalgebra of $C(S{U}_q(n))$ generated by elements of last $m$ rows of the fundamental matrix of $S{U}_q(n)$. Using $R$-matrix of type $A_{n-1}$, one can find certain relations involving elements of last $m$ rows only. In this paper, by analyzing these relations and using a result of Neshveyev \& Tuset, we establish $C(S{U}_q(n)/S{U}_q(n-m))$ as a universal $C^{\ast }$-algbera given by finite sets of generators and relations.