Isoperimetric inequality on Finsler metric measure manifolds with non-negative weighted Ricci curvature

In this paper, we define the volume entropy and the second Cheeger constant and prove a sharp isoperimetric inequality involving the volume entropy on Finsler metric measure manifolds with non-negative weighted Ricci curvature ${\mathrm{R}\mathrm{i}\mathrm{c}}_{\mathrm{\infty }}$. As an application, we prove a Cheeger-Buser type inequality for the first eigenvalue of Finsler Laplacian by using the volume entropy and the second Cheeger constant.