Price's law for scalar waves on 1+4 dimensional subextremal Myers-Perry spacetimes

We consider Myers--Perry spacetimes $(M,g_{\mathbf{a},\mathbf{b},\mathfrak{m}})$ in $1+4$ dimensions with two spin parameters $(\mathbf{a},\mathbf{b})\in\mathbb{R}^2$, which are a direct generalization of the well known Kerr spacetime in $1+3$ dimensions. We prove that the Hamiltonian flow associate