English

Lie $n$-centralizers of von Neumann algebras

Operator Algebras 2025-11-06 v1 Rings and Algebras

Abstract

Let \U\U be a von Neumann algebra with a projection P\UP\in \U. For any A1,A2,,An\U,A_1,A_2,\ldots,A_n\in\U, define p1(A1)=A1,p_1(A_1)=A_1, pn(A1,A2,,An)=[pn1(A1,A2,,An1),An]p_n (A_1,A_2,\ldots,A_n)=[p_{n-1} (A_1,A_2,\ldots,A_{n-1}),A_n] for all integers n2,n\geq 2, where [A,B]=ABBA[A,B]=AB-BA (A,B\U)(A,B\in\U) denotes the usual Lie product. Assume that ϕ:\U\U\phi:\U\to\U is an additive mapping satisfying ϕ(pn(A1,A2,,An))=pn(ϕ(A1),A2,,An)=pn(A1,ϕ(A2),,An)\phi(p_n(A_1, A_2, \ldots, A_n)) = p_n(\phi(A_1), A_2, \ldots, A_n) = p_n(A_1, \phi(A_2), \ldots, A_n) for all A1,A2,,An\UA_1, A_2, \ldots, A_n \in \U with A1A2=PA_1A_2=P In this article, it is shown that the map ϕ\phi is of the form ϕ(A)=WA+ξ(A)\phi(A)=WA+\xi(A) for all A\UA\in \U, where WZ(\U)W\in \mathrm{Z}(\U), and ξ:\UZ(\U)\xi:\U \to \Z(\U) (Z(\U)\Z(\U) is the center of \U\U) is an additive map such that ξ(pn(A1,A2,,An))=0\xi(p_n(A_1, A_2, \ldots, A_n) )=0 for any A1,A2,,An\UA_1, A_2, \ldots, A_n \in \U with A1A2=PA_1A_2=P. As an application, we characterize generalized Lie nn-derivations on arbitrary von Neumann algebras.

Keywords

Cite

@article{arxiv.2511.03523,
  title  = {Lie $n$-centralizers of von Neumann algebras},
  author = {Mohammad Ashraf and Mohammad Afajal Ansari and Md Shamim Akhter and Feng Wei},
  journal= {arXiv preprint arXiv:2511.03523},
  year   = {2025}
}