A Dynamical Systems Approach to the Kadison-Singer Problem

Details A Dynamical Systems Approach to the Kadison-Singer Problem A Dynamical Systems Approach to the Kadison-Singer Problem

2007-06-18

arxiv.org/abs/0706.2632v2

Mathematics

Operator Algebras

Typos corrected, comments and references added

Scientific paper

In these notes we develop a link between the Kadison-Singer problem and questions about certain dynamical systems. We conjecture that whether or not a given state has a unique extension is related to certain dynamical properties of the state. We prove that if any state corresponding to a minimal idempotent point extends uniquely to the von Neumann algebra of the group, then every state extends uniquely to the von Neumann algebra of the group. We prove that if any state arising in the Kadsion-Singer problem has a unique extension, then the injective envelope of a C*-crossed product algebra associated with the state necessarily contains the full von Neumann algebra of the group. We prove that this latter property holds for states arising from rare ultrafilters and $\delta$-stable ultrafilters, independent, of the group action and also for states corresponding to non-recurrent points in the corona of the group.

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