On the ends of Willmore surfaces with curvature decay

Abstract

For a properly embedded Willmore surface $\Sigma$ in ${\mathbb{R}}^3$, we prove that if the scale-invariant second fundamental form is sufficiently small near infinity, the surface has finitely many ends. Moreover, if this scale-invariant quantity vanishes at infinity, or if there is only one end, the total $L^2$-norm of the second fundamental form is finite.