Symmetry, Integrability and Geometry: Methods and Applications (Dec 2007)
On 1-Harmonic Functions
Abstract
Characterizations of entire subsolutions for the 1-harmonic equation of a constant 1-tension field are given with applications in geometry via transformation group theory. In particular, we prove that every level hypersurface of such a subsolution is calibrated and hence is area-minimizing over $mathbb{R}$; and every 7-dimensional $SO(2)imes SO(6)$-invariant absolutely area-minimizing integral current in $mathbb{R}^8$ is real analytic. The assumption on the $SO(2) imes SO(6)$-invariance cannot be removed, due to the first counter-example in $mathbb{R}^8$, proved by Bombieri, De Girogi and Giusti.
