Unbounded Kasparov modules for Cuntz-Pimsner algebras

Magnus Goffeng (University of Copenhagen)

Tuesday 2nd February, 2016 16:00-17:00 Maths 522


In this talk we will see how to construct an explicit unbounded representative of the defining extension for a Cuntz-Pimsner algebra (associated with a finitely generated bi-Hilbert module). The motivation comes from Cuntz-Krieger algebras. When studying one-sided subshifts of finite type, the "lag" appearing in the shift tail equivalence defines an unbounded operator on the Cuntz-Krieger algebra and can be assembled to an unbounded Kasparov module. The idea behind the construction in a more general setting is to generalize this operator that measures the "lag", i.e. a type of depth below the core. This is joint work with Bram Mesland and Adam Rennie.

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