H-umbilical Lagrangian submanifolds of the nearly Kähler S³ × S³

Abstract

H-umbilicity was introduced as an analogue of total umbilicity for Lagrangian submanifolds since, in some relevant cases, totally umbilical Lagrangian submanifolds are automatically totally geodesic. In this paper, we show that, in the homogeneous nearly Kähler S3 × S3, also H-umbilical Lagrangian submanifolds are automatically totally geodesic.