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Baptiste Chantraine (Université de Nantes)07/05/2021 10:45
Let L be a compact Lagrangian in a Weinstein manifold
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obtained from a subcritical one by attaching a handle along a Legendrian V. We will see how to associate to L a filling of a satelite of V and how this one induces a representation of the Chekanov-Eliashberg algebra of V. We will show that Legendrian contact homology linearised with respect to this representation recovers the Floer... -
Paolo Ghiggini (CNRS/Université de Nantes)07/05/2021 13:45
I will show that the standard contact structure on the real projective spaces RP^{4k+1} is not Liouville fillable using a classical argument on degeneration of moduli spaces of holomorphic spheres. A stronger result has been obtained by Zhengyi Zhou using more algebraic methods. This is a joint work with Klaus Niederküger
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6. Bi-invariant Lorentz-Finsler structures on the linear symplectic group and contactomorphism groupAlberto Abbondandolo (Ruhr-University Bochum)28/05/2021 10:45
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Marco Mazzucchelli28/05/2021 13:45
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Alfonso Sorrentino (University of Rome Tor Vergata)04/06/2021 10:45
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Yusuke Kawamoto (Ecole Normale Superieure)04/06/2021 13:45
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Pierre Dehornoy (Université Grenoble Alpes)11/06/2021 10:45
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Octav Cornea (University of Montreal)11/06/2021 13:45
Mixing triangulation (in the sense of triangulated categories) with persistence (as in persistence modules) leads to a class of interesting pseudo-metrics in a variety of examples: metric spaces, Tamarkin categories, filtered topological spaces, Fukaya
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categories. I will discuss some generalities concerning this machinery and how it specifically applies to the symplectic context. The talk is... -
Sushmita Venugopalan (Institute of Mathematical Sciences, Chennai)18/06/2021 10:45
A multiple cut operation on a symplectic manifold produces a collection of cut spaces, each containing relative normal crossing divisors. We explore what happens to curve count-based invariants when a collection of cuts is applied to a symplectic manifold. The invariant we consider is the Fukaya algebra of a Lagrangian submanifold that is contained in the complement of relative divisors. The...
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Steven Sivek18/06/2021 13:45
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Noémie Legout (Uppsala university)29/06/2021 15:00
I will define a Floer complex associated to a pair of transverse Lagrangian cobordisms in the symplectization of a contact manifold, by a count of SFT pseudo-holomorphic discs. Then I will show that this complex is endowed with an A_\infty structure. Moreover, I will describe a continuation element in the complex associated to a cobordism L and a small transverse push-off of L.
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Nancy Hingston (College of New Jersey)02/07/2021 10:45
String topology studies the algebraic structure of the homology of the free loop space of a manifold. I'll describe joint work with Nathalie Wahl about string topology operations, and about what these operations compute. We have simplified, chain-level definitions for the "loop" or "string" product and coproduct. The new definitions make possible new links between geometry and loop products....
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Leonid Polterovich (Tel Aviv University)02/07/2021 13:45
I will discuss three "big fiber theorems", the Centerpoint Theorem from combinatorics, the Gromov Maximal Fiber Theorem from topology, and the Non-displaceable Fiber Theorem by Entov and myself, from a unified viewpoint provided by Gromov's ideal-valued measures.
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The latter theory, in the symplectic context, is combined with relative symplectic cohomology developed by Varolgunes, yielding... -
Felix Schlenk (Université de Neuchâtel)02/07/2021 15:15
While by a result of McDuff the space of symplectic embeddings of a closed 4-ball into an open 4-ball is connected,
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the situation for embeddings of cubes 𝐶4=𝐷2×𝐷2 is very different. For instance, for the open ball 𝐵4 of capacity 1, there exists an explicit decreasing sequence 𝑐1,𝑐2,⋯→1/3 such that for 𝑐<𝑐𝑘 there are at least 𝑘 symplectic embeddings of the closed cube 𝐶4(𝑐) of capacity 𝑐 into... -
Kaoru Ono (Research Institute for Mathematical Sciences, Kyoto University)09/07/2021 10:45
I will present a set-up for orbifold Lagrangian Floer theory,
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We introduce the notion of dihedral twisted sectors for Lagrangians, intersections of Lagrangians. Then I explain their role in the construction of Floer theory. It is in collaboration with Bohui Chen and Bai-Ling Wang. -
Georgios Dimitroglou Rizell (Uppsala University)09/07/2021 13:45
We discuss joint work with M. Sullivan where we show that a contactomorphism cannot squeeze some fixed Legendrian knot into an arbitrarily small neighbourhood of a non-Legendrian knot, under the additional constraint that the two knots become isotopic inside the neighbourhood, and that the contact manifold is tight. The techniques used are Giroux's theory of convex surfaces combined with...
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Morgan Weiler13/07/2021 15:00
Knot-filtered embedded contact homology is an invariant of an elliptic Reeb orbit of any contact form for a given contact structure on a closed, oriented three-manifold. It was introduced in a 2016 paper of Hutchings and enables embedded contact homology (ECH) to recover the Calabi invariant of the return map of a global surface of section of the Reeb vector field. Knot-filtered ECH is an...
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Helmut Hofer (Institute for Advanced Study, Princeton)16/07/2021 15:15
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