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Quantum stochastic calculus on full Fock space

100%
Skeide M.
Banach Center Publications
|
1998
|
tom 43
|
nr 1
369-379
EN
We present a new version of integration of time-adapted processes with respect to creation, annihilation and conservation processes on the full Fock space. Among the new features, in the first place, there is a new formulation of adaptedness which is both simpler and more general than the known ones. The new adaptedness allows for processes which are not restricted to be elements of some norm closure of the ∗-algebra which is generated by the basic creation processes.
2
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Commutants of von Neumann correspondences and duality of Eilenberg-Watts theorems by Rieffel and by Blecher

100%
Skeide M.
Banach Center Publications
|
2006
|
tom 73
|
nr 1
391-408
EN
The category of von Neumann correspondences from 𝓑 to 𝓒 (or von Neumann 𝓑-𝓒-modules) is dual to the category of von Neumann correspondences from 𝓒' to 𝓑' via a functor that generalizes naturally the functor that sends a von Neumann algebra to its commutant and back. We show that under this duality, called commutant, Rieffel's Eilenberg-Watts theorem (on functors between the categories of representations of two von Neumann algebras) switches into Blecher's Eilenberg-Watts theorem (on functors between the categories of von Neumann modules over two von Neumann algebras) and back.
3
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The Powers sum of spatial CPD-semigroups and CP-semigroups

100%
Skeide M.
Banach Center Publications
|
2010
|
tom 89
|
nr 1
247-263
EN
We define spatial CPD-semigroups and construct their Powers sum. We construct the Powers sum for general spatial CP-semigroups. In both cases, we show that the product system of that Powers sum is the product of the spatial product systems of its factors. We show that on the domain of intersection, pointwise bounded CPD-semigroups on the one side and Schur CP-semigroups on the other, the constructions coincide. This summarizes all known results about Powers sums and generalizes them considerably.
4
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Restrictions of CP-semigroups to maximal commutative subalgebras

63%
Fagnola F., Skeide M.
Banach Center Publications
|
2007
|
tom 78
|
nr 1
121-132
EN
We give a necessary and sufficient criterion for a normal CP-map on a von Neumann algebra to admit a restriction to a maximal commutative subalgebra. We apply this result to give a far reaching generalization of Rebolledo's sufficient criterion for the Lindblad generator of a Markov semigroup on ℬ(G).
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