d-invariants of branched double covers of links

To a 3-manifold that takes the form of a rational homology 3-sphere, one can associate d-invariants, certain numerical invariants coming from Heegaard Floer theory. The d-invariant is related to the classical Casson-Walker invariant, and has applications to 4-manifold topology. In this talk, we will discuss d-invariants of double covers of the 3-sphere branched along links that come from plumbing graphs. We will give some new partial computations and a conjecture. Part of this is joint with Marco Marengon.

Meeting ID: 931 7291 0947
For passcode contact Christian Kaiser (kaiser@mpim...).