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Séminaire de Géométrie Enumérative
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Année 2018 - 2019 Temps : Vendredi à 10h30 Lieu : Jussieu, 1516 - 413 Institut de Mathématiques de Jussieu - Paris Rive Gauche, Sorbonne Université |
| Date | Orateur | Titre et résumé | Lieu |
| 12/10/2018 |
Nicolas Perrin, Université de Versailles |
Positivité pour la K-théorie quantique de la grassmannienne |
Jussieu, 1516 - 413 |
| 19/10/2018 |
Marco Robalo,
IMJ-PRG, Sorbonne Université |
Matrix Factorizations and Vanishing Cycles 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. |
Jussieu, 1516 - 413 |
| 16/11/2018 |
Hülya Argüz, Imperial College London |
Tropical and log corals on the Tate curve 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. |
Jussieu, 1516 - 413 |
| 07/12/2018 |
Dimitri Zvonkine, CNRS et Université de Versailles |
An introduction to the double ramification hierarchies by Buryak and Rossi |
Jussieu, 1516 - 413 |
| 14/12/2018 |
Guillaume Chapuy, CNRS et IRIF |
Constellations, Weighted Hurwitz numbers, and topological recursion (a combinatorialist's view) |
Jussieu, 1516 - 413 |
| 18/01/2019 |
Oliver Lorscheid, IMPA |
Tropical scheme theory In 2013, Giansiracusa and Giansiracusa have found a way to use F1-geometry for tropical geometry. More precisely, they define the scheme-theoretic tropicalization of a classical variety and show that the set-theoretic tropicalization can be retrieved as the set of T-rational points. The scheme-theoretic tropicalization carries more information than the set-theoretic tropicalization. For example, it knows about the Hilbert polynomial of the classical variety and the weights of the (maximal cells of the) set-theoretic tropicalization. There are hopes that this will be useful for future developments, such as tropical sheaf cohomology, a cohomological approach to intersection theory, flat tropical families, and more. However, some fundamental problems remain unsolved so far. For example, it is not clear how to approach dimension theory or decompositions into irreducible components. It is not even clear what a good notion of a tropical scheme should be since the class of semiring schemes contains too many and pathological objects. In this talk we give an introduction to tropical scheme theory and an overview of this circle of ideas. |
Jussieu, 1516 - 413 |
| 25/01/2019 |
Sergey Finashin, Middle East Technical University |
Welschinger weights and Segre indices for real lines on real hypersurfaces In a joint work with V. Kharlamov, we explained how one may count real lines on real hypersurfaces (when their number is generically finite) with signs, so that the sum is independent of the choice of a hypersurfaces. These signs were assumed conjecturally to be equal to some multidimensional version of Welschinger weights. After elaborating this version of the weights, we proved this conjecture. We developed also a more geometric way of calculation : using the idea of Segre, who introduced two species of real lines on a cubic surface : hyperbolic and elliptic. |
Jussieu, 1516 - 413 |
| 01/02/2019 |
Thomas Blomme, IMJ-PRG, Sorbonne Université |
Scattering diagrammes, indices quantiques et géométrie énumérative réelle En géométrie énumérative, l'approche tropicale est parfois fort utile pour calculer effectivement certains invariants de part la nature combinatoire de cette dernière. De plus, sa richesse structurelle permet en fait de calculer bien plus que les invariants qui nous intéressent, et c'est par exemple le cas des polynômes de Block-Göttsche. Dès lors se pose la question de l'interprétation de tels invariants en géométrie classique et de nombreuses restent encore ouvertes. Dans le cas des courbes planes, Mikhalkin propose d'interpréter le polynôme de Block-Göttsche comme un comptage de courbes réelles satisfaisant des conditions de tangence à l'infini en les discriminant suivant la valeur que prend l'aire de leur amibe. Nous allons tenter de poser les bases de ce que pourrait être un analogue en dimension supérieure. |
Jussieu, 1516 - 413 |
| 08/02/2019 |
Pierrick Bousseau, ETH Zürich |
Sur les nombres de Betti des espaces de modules de faisceaux semi-stables sur le plan projectif Je vais présenter un nouvel algorithme, à l’allure tropicale, calculant les nombres de Betti (pour la cohomologie d’intersection) des espaces de modules de faisceaux semi-stables sur le plan projectif. Je finirai par une application à une question a priori sans rapport en théorie de Gromov-Witten. |
Jussieu, 1516 - 413 |
| 08/22/2019 |
Paolo Rossi, Università degli Studi di Padova |
Quadratic double ramification integrals and KdV on the non-commutative torus It's a result of Richard Hain that the restriction of the double ramification cycle to the space of compact type curves (i.e. stable curves with no non-separating nodes) is Θg/g!, where Θ is the theta divisor in the universal Jacobian (suitably pulled back to the moduli space itself via the marked points). A natural completion of this class is given by exp(Θ), which gives an infinite rank partial cohomological field theory. To such an object one can attach a double ramification hierarchy (thereby putting into play a second DR cycle, hence the "quadratic" in the title). It is possible to compute this hierarchy and trade its infinite rank for an extra space dimension, hence obtaining an integrable hierarchy in 2+1 dimensions which is the natural extension of the usual KdV hierarchy on a non-commutative torus. Its quantization is also provided, obtaining an integrable (2+1) non-relativistic quantum field theory on the non-commutative torus. |
Jussieu, 1516 - 413 |
| 08/03/2019 |
Adrien Sauvaget, Utrecht University |
Masur-Veech volumes and intersection theory on the projectivized Hodge bundle In the 80's Masur and Veech defined the volume of moduli spaces Riemann surfaces endowed with a flat metric with conical singularities. We show that these volumes can be expressed as intersection numbers on the projectivized Hodge bundle over the moduli space of curves (this is a joint work with D. Chen, M. Moeller, and D. Zagier). |
Jussieu, 1516 - 413 |
| 15/03/2019 |
Xujia Chen, Stony Brook University |
Kontsevich-type recursions for counts of real curves |
Jussieu, 1516 - 413 |
| 29/03/2019 |
Florent Schaffhauser, Université de Strasbourg & Universidad de Los Andes |
Topologie des variétés de représentations de groupes fuchsiens Le but de l'exposé est de présenter quelques progrès récents dans l'étude la topologie des variétés de représentations de groupes fuchsiens. On s'intéressera principalement à deux exemples, les fibrés vectoriels sur les courbes algébriques réelles et les composantes de Hitchin pour les groupes fondamentaux orbifold, et on montrera par exemple que la composante de Hitchin d'une surface orientable à bord (introduite par McShane et Labourie en 2009) est homéomorphe à un espace vectoriel dont la dimension est donnée par la même formule que celle obtenue par Hitchin dans le cas des surfaces fermées. Plus généralement, nous verrons que les composantes de Hitchin orbifold fournissent des sous-variétés totalement géodésiques contractiles des composantes de Hitchin classiques (pour toute métrique invariante sous l'action du groupe modulaire), dont on peut calculer la dimension et montrer qu'elles fournissent des exemples d'espaces de Teichmüller supérieurs, au même titre que les composantes de Hitchin associées aux groupes de surfaces. |
Jussieu, 1516 - 413 |
| 19/04/2019 |
Alexander Alexandrov, IBS Center for Geometry and Physics |
Constellations, Weighted Hurwitz numbers, and topological
recursion (a mathematical physicist's view) In my talk I will discuss some elements of the proof of the topological recursion for the weighted Hurwitz numbers. The main ingredient is the tau-function - the all genera generating function, which is a solution of the integrable KP or Toda hierarchy. My talk as based on a series of joint papers with G. Chapuy, B. Eynard, and J. Harnad. |
Jussieu, 1516 - 413 |
| 14/06/2019 |
Alex Degtyarev, Bilkent University |
Tritangents to sextic curves via Niemeier lattices I suggest a new approach, based on the embedding of the (modified) Néron—Severi lattice to a Niemeier lattice, to the following conjecture : The number of tritangents to a smooth sextic is 72, 66 (each realized by a single curve), or less. The maximal number of real tritangents to a real smooth sextic is 66. (Observed are all counts except 65 and 63.) The computation becomes much easier (linear algebra in well-studied lattices rather than abstract number theory), and it has been completed for all but Leech lattices. At present, I am 99% sure that I can eliminate the Leech lattice, settling the above conjecture. |
Jussieu, 1525 - 502 |
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21/06/2019 |
Albrecht Klemm, HCM, University of Bonn |
Topological String on compact Calabi-Yau threefolds We review the world-sheet derivation of the holomorphic anomaly equations fullfilled by the all genus topological string partition function Z on Calabi-Yau 3-folds M. Interpreting Z as a wave function on H3 (M, ℝ) these equations can be viewed as describing infinitessimal changes of the sympletic frame. A recursive solution for Z to high genus is provided using modular building blocks obtained by the periods of M as well as constraints on the local expansion of Z near singular loci in the complex moduli space of M in appropriate symplectic frames. Some recent applications of these ideas to elliptic fibred Calabi-Yau spaces are given. |
Jussieu, 1516 - 413 |
| 28/06/2019 10h |
Eugenii Shustin, Tel Aviv University |
Singular Welschinger invariants We discuss real enumerative invariants counting real deformations of plane curve singularities. A versal deformation base of a plane curve singularity contains local Severi varieties that parameterize deformations with a given delta-invariant. The local Severi varieties are analytic space germs and their (complex) multiplicities were computed by Beauville, Fantecci-Goettsche-van Straten, and Shende. For the equigeneric locus (local Severi variety corresponding to the maximal delta-invariant), a real multiplicity was introduced by Itenberg-Kharlamov-Sh. as a Welschinger-type signed count of certain equigeneric deformations. We show that similar real multiplicities can be defined for some other local Severi varieties as well as for all equiclassical loci (which count equigeneric deformations with a given number of cusps). We exhibit some examples and state open problems. |
Jussieu, 1516 - 413 |