On the deformation of inversive distance circle packings, III

Given a triangulated surface $M$, we use Ge-Xu's $\alpha$-flow \cite{Ge-Xu1} to deform any initial inversive distance circle packing metric to a metric with constant $\alpha$-curvature. More precisely, we prove that the inversive distance circle packing with constant $\alpha$-curvature is unique if $\alpha\chi(M)\leq 0$, which generalize Andreev-Thurston's rigidity results for circle packing with constant cone angles. We further prove that the solution to Ge-Xu's $\alpha$-flow can always be extended to a solution that exists for all time and converges exponentially fast to constant $\alpha$-curvature. Finally, we give some combinatorial and topological obstacles for the existence of constant $\alpha$-curvature metrics.