English

Orthogonally additive, orthogonality preserving, holomorphic mappings between C*-algebras

Operator Algebras 2013-10-02 v1 Functional Analysis

Abstract

We study holomorphic maps between C^*-algebras AA and BB. When f:BA(0,ϱ)Bf:B_A (0,\varrho) \longrightarrow B is a holomorphic mapping whose Taylor series at zero is uniformly converging in some open unit ball U=BA(0,δ)U=B_{A}(0,\delta) and we assume that ff is orthogonality preserving on AsaUA_{sa}\cap U, orthogonally additive on UU and f(U)f(U) contains an invertible element in BB, then there exist a sequence (hn)(h_n) in BB^{**} and Jordan ^*-homomorphisms Θ,Θ~:M(A)B\Theta, \widetilde{\Theta} : M(A) \to B^{**} such that f(x)=n=1hnΘ~(an)=n=1Θ(an)hn, f(x) = \sum_{n=1}^\infty h_n \widetilde{\Theta} (a^n)= \sum_{n=1}^\infty {\Theta} (a^n) h_n, uniformly in aUa\in U. When BB is abelian the hypothesis of BB being unital and f(U)inv(B)f(U)\cap \hbox{inv} (B) \neq \emptyset can be relaxed to get the same statement.

Keywords

Cite

@article{arxiv.1310.0407,
  title  = {Orthogonally additive, orthogonality preserving, holomorphic mappings between C*-algebras},
  author = {Jorge J. Garcés and Antonio M. Peralta and Daniele Puglisi and María I. Ramírez},
  journal= {arXiv preprint arXiv:1310.0407},
  year   = {2013}
}