Journal of the
Korean Mathematical Society
JKMS

ISSN(Print) 0304-9914 ISSN(Online) 2234-3008

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J. Korean Math. Soc. 2017; 54(2): 563-574

Online first article December 27, 2016      Printed March 1, 2017

https://doi.org/10.4134/JKMS.j160127

Copyright © The Korean Mathematical Society.

Maps preserving some multiplicative structures on standard Jordan operator algebras

Somaye Ghorbanipour and Shirin Hejazian

Ferdowsi University of Mashhad, Ferdowsi University of Mashhad

Abstract

Let $\mathcal A$ be a unital real standard Jordan operator algebra acting on a Hilbert space $H$ of dimension at least 2. We show that every bijection $\phi$ on $\mathcal A$ satisfying $\phi(A^2\circ B)=\phi(A)^2\circ \phi(B)$ is of the form $\phi=\varepsilon\psi$ where $\psi$ is an automorphism on $\mathcal A$ and $\varepsilon \in \{-1, 1\}$. As a consequence if $\mathcal A$ is the real algebra of all self-adjoint operators on a Hilbert space $H$, then there exists a unitary or conjugate unitary operator $U$ on $H$ such that $\phi(A)=\varepsilon UAU^{*}$ for all $A\in \mathcal A$.

Keywords: standard Jordan operator algebra, preserver map, Jordan product

MSC numbers: 47B49, 39B52

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