Brendan Owens:
A knot concordance invariant from definite cobordisms.
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Abstract: I will address the question of which Dehn surgeries on a knot may
bound smooth negative-definite four-manifolds,
and show that this gives rise to a concordance invariant.  I will discuss
some properties of this invariant and compute it for torus knots.  This is
joint work with Saso Strle.