Announcement: Two Geometry seminars 12 & 13 September + Dinner

[ZUDDAS DANIELE]

Dear all,

on 12 and 13 September we will host two talks by Dr. Marco Marengon at our Department that will take place in Sala Seminario, III floor of H2bis building, Via Valerio 12/1. 

On Thursday 12 we will have a social dinner at Trattoria Al Nuovo Antico Pavone, willing to join please let me know by email as soon as possible.

Everybody is welcome!


September 12 at 15:00
Title: Splitting links by integer homology spheres 

Abstract: We show that there exists a submanifold of the 4-sphere diffeomorphic to $S^2 \sqcup S^2$ whose components are separated by an integer homology 3-sphere Y (i.e., a manifold with the same integer homology of the 3-sphere), but not by the standard 3-sphere. 
This is joint work with Marco Golla.



September 13 at 15:00 (more specialistic)
Title: Correction terms of double branched covers and symmetries of immersed curves

Abstract: We compare the signatures of a classical link in the 3-sphere with the d-invariants of its double branched cover in the spinnable spinc structures. Using a symmetry on the immersed curves description of bordered Floer homology, we define a new invariant of bordered homology solid tori, and we relate it to both the d-invariants and the link signatures. We deduce that when L is a 2-component link and its double branched cover is an L-space, the spin d-invariants are determined by the signatures of L.
This is joint work with Jonathan Hanselman and Biji Wong.