Paul McKenney: Forcing axioms and the rigidity of corona algebras

Mathematical logic seminar – February 26 2013
Time:     12:00 – 13:20

Room:     Wean Hall 7201

Speaker:         Paul McKenney
Department of Mathematical Sciences
Carnegie Mellon University

Title:     Forcing axioms and the rigidity of corona algebras

Abstract:

Certain independence phenomena in set-theoretic topology have recently been shown to extend to the setting of operator algebras. For instance, in analogy to Shelah’s landmark proof of the consistency of the statement “All automorphisms of P(omega) / fin are induced by a function from omega into itself”, Farah has shown that, consistently, every automorphism of the Calkin algebra over a Hilbert space must be inner. I will discuss how both of these results are subsumed by a wide-reaching conjecture of Coskey and Farah, concerning the rigidity of corona algebras under forcing axioms; and some of my recent results in proving specific instances of this conjecture.

The first talk will include a gentle introduction to the theory of C*-algebras, with motivation coming from set-theoretic topology.

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