On CR maps from the sphere into the tube over the future light cone

Michael Reiter, Duong Ngoc Son

We determine all local smooth or formal CR maps from the unit sphere ${\mathbb{S}}^3\subset {\mathbb{C}}^2$ into the tube $\mathcal{T}:= \mathcal{C} \times i\mathbb{R}^3 \subset \mathb…