A new class of examples of group-valued moment maps

The purpose of this paper is to construct new examples of group-valued moment maps. As the main tool for construction of such examples we use quasi-symplectic implosion which was introduced in [HJS06]. More precisely we show that there are certain strata of $D\mathbf{S}\mathbf{p}(n{)}_{\mathrm{i}\mathrm{m}\mathrm{p}\mathrm{l}}$, the universal imploded space, where it is singular but whose closure is a smooth quasi-Hamiltonian $\mathbf{S}\mathbf{p}(n)\times T$ space.