English

Maps preserving peripheral spectrum of generalized Jordan products of operators

Functional Analysis 2014-02-06 v1 Operator Algebras

Abstract

Let X1X_1 and X2X_2 be complex Banach spaces with dimension at least three, A1\mathcal{A}_1 and A2\mathcal{A}_2 be standard operator algebras on X1X_1 and X2X_2, respectively. For k2k\geq2, let (i1,...,im)(i_1,...,i_m) be a sequence with terms chosen from {1,,k}\{1,\ldots,k\} and assume that at least one of the terms in (i1,,im)(i_1,\ldots,i_m) appears exactly once. Define the generalized Jordan product T1T2Tk=Ti1Ti2Tim+TimTi2Ti1T_1\circ T_2\circ\cdots\circ T_k=T_{i_1} T_{i_2}\cdots T_{i_m}+T_{i_m}\cdots T_{i_2} T_{i_1} on elements in Ai\mathcal{A}_i. This includes the usual Jordan product A1A2+A2A1A_1A_2+A_2A_1, and the Jordan triple A1A2A3+A3A2A1A_1A_2A_3+A_3A_2A_1. Let Φ:A1A2\Phi:\mathcal{A}_1\rightarrow\mathcal{A}_2 be a map with range containing all operators of rank at most three. It is shown that Φ\Phi satisfies that σπ(Φ(A1)Φ(Ak))=σπ(A1Ak)\sigma_\pi(\Phi(A_1)\circ\cdots\circ\Phi(A_k))=\sigma_\pi(A_1\circ\cdots\circ A_k) for all A1,,AkA_1, \ldots, A_k, where σπ(A)\sigma_\pi(A) stands for the peripheral spectrum of AA, if and only if Φ\Phi is a Jordan isomorphism multiplied by an mmth root of unity.

Keywords

Cite

@article{arxiv.1402.0946,
  title  = {Maps preserving peripheral spectrum of generalized Jordan products of operators},
  author = {Wen Zhang and Jinchuan Hou and Xiaofei Qi},
  journal= {arXiv preprint arXiv:1402.0946},
  year   = {2014}
}

Comments

24 pages. arXiv admin note: substantial text overlap with arXiv:1004.3832