Hokkaido University Preprint Series in Mathematics
We study the mean curvature ow of graphs both with Neumann boundary conditions and transport terms. We derive boundary gradient estimates for the mean curvature ow. As an application, the existence of the mean curvature ow of graphs is presented. A key argument is a boundary monotonicity formula of a Huisken type derived using re ected backward heat kernels. Furthermore, we provide regularity conditions for the transport terms.