Buondì,

Vi segnalo il seminario di geometria di giovedì prossimo (ore 16 aula seminari). Siete tutti invitati,
A presto,
   Bruno Martelli

Thursday, October 4, 2018 16:00 17:00
SEMINARI DI GEOMETRIA
Sala Seminari (Dip. Matematica)
Transverse invariants from the deformations of Khovanov sl_3 homology
Carlo Collari

In this talk I will describe some invariants for transverse links in  
S^3 (endowed with the symmetric contact structure) arising from the  
deformations of Khovanov sl_3 homology.

I will start with a brief introduction to the theory of transverse  
links in S^3. Afterward, I will recall some known results concerning  
transverse invariants in link homologies. In particular, I will focus  
on the invariants coming from Khovanov-Rozansky homologies, and those coming from the deformations of Khovanov homology.

After the introductory part, I will briefly describe the construction  
and the properties of the universal sl_3 link homology, due to Mackaay and Vaz, and define the transverse invariants. These invariants, which are called the \beta_3-invariants, are cycles in the universal sl_3 complex.

Finally, I will state a result concerning the vanishing of the  
homology classes of these invariants, and compare it with similar  
results known for other invariants. The idea of the proof will be also  
given. Time permitting, I will also give a number of Bennequin-type  
inequalities which can be proved using the \beta_3-invariants.