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- W2963447867 abstract "Let $${mathcal{T}_{+}(E)}$$ be the tensor algebra of a W*-correspondence E over a W*-algebra M. In earlier work, we showed that the completely contractive representations of $${mathcal{T}_{+}(E)}$$ , whose restrictions to M are normal, are parametrized by certain discs or balls $${overline{D(E,sigma)}}$$ indexed by the normal *-representations $${sigma}$$ of M. Each disc has analytic structure, and each element $${Fin mathcal{T}_{+}(E) }$$ gives rise to an operator-valued function $${widehat{F}_{sigma}}$$ on $${overline{D(E,sigma)}}$$ that is continuous and analytic on the interior. In this paper, we explore the effect of adding operator-valued weights to the theory. While the statements of many of the results in the weighted theory are anticipated by those in the unweighted setting, substantially different proofs are required. Interesting new connections with the theory of completely positive maps are developed. Our perspective has been inspired by work of Vladimir Muller (J Oper Theory 20(1):3–20, 1988) in which he studied operators that can be modeled by parts of weighted shifts. Our results may be interpreted as providing a description of operator algebras that can be modeled by weighted tensor algebras. Our results also extend work of Gelu Popescu (Mem Am Math Soc 200(941):vi+91, 2009), who investigated similar questions." @default.
- W2963447867 created "2019-07-30" @default.
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- W2963447867 date "2016-03-14" @default.
- W2963447867 modified "2023-10-12" @default.
- W2963447867 title "Matricial Function Theory and Weighted Shifts" @default.
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- W2963447867 doi "https://doi.org/10.1007/s00020-016-2281-6" @default.
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