Singular periodic solutions to a critical equation in the Heisenberg group

Abstract

We construct positive solutions to the equation $$-{\Delta }_{{\mathbf{H}}^n}u=u^{\frac{Q+2}{Q-2}}$$ on the Heisenberg group, singular in the origin, similar to the Fowler solutions of the Yamabe equations on ${\mathbf{R}}^n$. These satisfy the homogeneity property $u\circ {\delta }_T=T^{-\frac{Q-2}{2}}u$ for some $T$ large enough, where $Q=2n+2$ and ${\delta }_T$ is the natural dilation in ${\mathbf{H}}^n$. We use the Lyapunov-Schmidt method applied to a family of approximate solutions built by periodization from the global regular solution classified by Jerison and Lee.

22 pages