Reversibility of Hermitian Isometries

Abstract

An element $g$ in a group $G$ is called reversible (or real) if it is conjugate to $g^{-1}$ in $G$, i.e., there exists $h$ in $G$ such that $g^{-1}=hg{h}^{-1}$. The element $g$ is called strongly reversible if the conjugating element $h$ is an involution (i.e., element of order at most two) in $G$. In this paper, we classify reversible and strongly reversible elements in the isometry groups of $\mathbb{F}$-Hermitian spaces, where $\mathbb{F}=\mathbb{C}$ or $\mathbb{H}$. More precisely, we classify reversible and strongly reversible elements in the groups $\mathrm{Sp}(n)⋉{\mathbb{H}}^n$, $\mathrm{U}(n)⋉{\mathbb{C}}^n$ and $\mathrm{SU}(n)⋉{\mathbb{C}}^n$. We also give a new proof of the classification of strongly reversible elements in $\mathrm{Sp}(n)$.

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