Maps Preserving Commutativity up to a Factor on Standard Operator Algebras

Abstract:

      Let $X$, $Y$ be real or complex Banach spaces with dimension greater than 2 and ${\mathcal A}$, ${\mathcal B}$ be standard operator algebras on $X$ and $Y$, respectively. Let $\Phi:\mathcal A \rightarrow \mathcal B$ be a unital surjective map. In this paper, we characterize the map $\Phi$ on $\mathcal A$ which satisfies $(A-B)R=\xi R(A-B)\Leftrightarrow (\Phi(A)-\Phi(B))\Phi(R)=\xi\Phi(R)(\Phi(A)-\Phi(B))$ for $A,B,R\in \mathcal A$ and for some scalar $\xi$.