Invariant Weakly Positive Semidefinite Kernels with Values in Topologically Ordered $*$-Spaces

Autor:	Ay, Serdar, Gheondea, Aurelian
Rok vydání:	2017
Předmět:	Mathematics - Functional Analysis Mathematics - Operator Algebras 47A20 43A35 46E22 46L89
Druh dokumentu:	Working Paper
Popis:	We consider weakly positive semidefinite kernels valued in ordered $*$-spaces with or without certain topological properties, and investigate their linearisations (Kolmogorov decompositions) as well as their reproducing kernel spaces. The spaces of realisations are of VE (Vector Euclidean) or VH (Vector Hilbert) type, more precisely, vector spaces that possess gramians (vector valued inner products). The main results refer to the case when the kernels are invariant under certain actions of $*$-semigroups and show under which conditions $*$-representations on VE-spaces, or VH-spaces in the topological case, can be obtained. Finally we show that these results unify most of dilation type results for invariant positive semidefinite kernels with operator values as well as recent results on positive semidefinite maps on $*$-semigroups with values operators from a locally bounded topological vector space to its conjugate $Z$-dual space, for $Z$ an ordered $*$-space. Comment: 35 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1701.04740 Zobrazit plný text záznamu View this record from Arxiv