Profinite groups with an automorphism whose fixed points are right Engel

Abstract

An element $g$ of a group $G$ is said to be right Engel if for every $x\in G$ there is a number $n=n(g,x)$ such that $[g,{}_{n}x]=1$. We prove that if a profinite group $G$ admits a coprime automorphism $\phi$ of prime order such that every fixed point of $\phi$ is a right Engel element, then $G$ is locally nilpotent.