Contact real hypersurfaces in the complex hyperbolic quadric

TL;DR

This paper provides a new proof for classifying contact real hypersurfaces with constant mean curvature in the complex hyperbolic quadric, showing they are congruent to specific geometric tubes or horospheres.

Contribution

It offers a novel proof of the classification theorem, identifying all such hypersurfaces as tubes around certain submanifolds or horospheres in the complex hyperbolic quadric.

Findings

Hypersurfaces are congruent to tubes around ${Q^{m-1}}^*$ or ${ m R}H^m$

Hypersurfaces include horospheres induced by $rak A$-principal geodesics

Classification applies for all $m  3$ in the complex hyperbolic quadric

Abstract

We give a new proof of the classification of contact real hypersurfaces with constant mean curvature in the complex hyperbolic quadric ${Q^m}^* = SO_{m,2}^o/SO_mSO_2$, where $m\geq 3$. We show that a contact real hypersurface $M$ in ${Q^m}^*$ for $m\geq 3$ is locally congruent to a tube of radius $r{\in}{\mathbb R}^+$ around the complex hyperbolic quadric ${Q^{m-1}}^*$, or to a tube of radius $r\in\mathbb{R}^+$ around the $\mathfrak A$-principal $m$-dimensional real hyperbolic space ${\mathbb R}H^m$ in ${Q^m}^* = SO_{m,2}^o/SO_mSO_2$, or to a horosphere in ${Q^{m-1}}^*$ induced by a class of $\mathfrak A$-principal geodesics in ${Q^m}^*$.