**
Boris Botvinnik, University of Oregon**

**Title: Families of diffeomorphisms (and
concordances
detected by trivalent graphs
(with applications to psc-metrics)**

**Abstract:** This is a joint work with Tadayuki Watanabe. We use
earlier results by Watanabe to prove that the non-trivial
elements of the homotopy groups
π_{*}BDiff_{∂}(D^{d})⊗ **Q** (which
are detected by the Kontsevich characteristic classes valued in
the algebra of trivalent graphs) are lifted to elements in
π_{*}C(D^{d}) of the pseudo-isotopy space. Here d > 3.
I
will discuss mostly the case when the dimension d is even. We also
prove that those elements are lifted to corresponding moduli spaces of
psc-metrics.