Abstract
A surface Σ0 is a graph in R4 if there is a unit constant 2-form w in R4 such that ‹e1 ∧ e2, w› ≥ v0 > 0, where {e1, e2} is an orthonormal frame on Σ0. In this paper, we investigate a 2-dimensional surface Σ evolving along a mean curvature flow with a forcing term in direction of the position vector. If v0 ≥ ${1 \over \sqrt {2}}$ holds on the initial graph Σ0 which is the immersion of the surface Σ, and the coefficient function of the forcing vector is nonnegative, then the forced mean curvature flow has a global solution, which generalizes part of the results of Chen-Li-Tian in [2].
