Some Energy Properties Of Yang-Mills Connections

We consider a vector bundle E over a compact Riemannian manifold M=Mn, n≥ 4, and A is a Yang-Mills connection with Lπ/2 curvature FA on E. Then we prove a mean value inequality for the density |FA|π/2. This inequality give rise to an energy concentrate principle for sequences of solutions that have bounded energy. We also proof that the energy must be bounded from below by some positive constant unless E is a flat bundle.