On the Cheng-Yau gradient estimate for Carnot groups and sub-Riemannian manifolds

Fabrice Baudoin, Maria Gordina, Phanuel Mariano

In this note we show how results in \cite{BaudoinBonnefont2016, BaudoinGarofalo2013, CoulhonJiangKoskelaSikora2017} yield the Cheng-Yau estimate on two classes of sub-Riemannian ma…