Sorbonne Université CNRS Paris Diderot

Géométrie énumérative


Année 2018- 2019

Organisateurs :
Penka Georgieva, Ilia Itenberg.

Guillaume Chapuy - CNRS et IRIF

Constellations, Weighted Hurwitz numbers, and topological recursion (a combinatorialist’s view)

vendredi 14 décembre 2018 à 10:30 : Jussieu, salle 1516-413

Dimitri Zvonkine - Laboratoire de Mathématiques de Versailles

An introduction to the double ramification hierarchies by Buryak and Rossi

vendredi 7 décembre 2018 à 10:30 : Jussieu, salle 1516-413

Hülya Argüz - Imperial College Londres

Tropical and log corals on the Tate curve

vendredi 16 novembre 2018 à 10:30 : Jussieu, salle 1516-413

We will discuss an algebro-geometric approach to the symplectic cohomology ring, in terms of tropical geometry and punctured log Gromov-Witten theory of Abramovich-Chen-Gross-Siebert. During this talk, we will restrict ourselves to the Tate curve, the total space of a degeneration of elliptic curves to a nodal elliptic curve. To understand the symplectic cohomology of the Tate curve (minus its central fiber), we will go through the Fukaya category of the elliptic curve and describe this category using tropical Morse trees introduced by Abouzaid-Gross-Siebert.

Marco Robalo - IMJ-PRG

Matrix Factorizations and Vanishing Cycles

vendredi 19 octobre 2018 à 10:30 : Jussieu, salle 1516-413

In this talk I will describe a joint work with B. Toen, G. Vezzosi and A. Blanc, relating categories of matrix factorisations to sheaves of vanishing cycles. Most of the talk will be a review of the theory of vanishing cycles and matrix factorisations and how they can be related in the theory of motives.

Nicolas Perrin - Université de Versailles

Positivité pour la K-théorie quantique de la grassmannienne

vendredi 12 octobre 2018 à 10:30 : Jussieu, salle 1516-413