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### Thursday, January 26, 2017

 All day

 Before 01 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Conference - CAST - Contact and Symplectic Topology Jan 26, 2017 to Jan 28, 2017 Download the poster in pdf Nantes, from January 26th to January 28th Organization board: Baptiste Chantraine, Vincent Colin, Paolo Ghiggini Scientific board: Jean-François Barraud, Baptiste Chantraine, Kai Cieliebak, Tobias Ekholm                                     Leclercq Jan 26, 2017 By using generating functions, Viterbo constructed spectral invariants for Lagrangians of cotangent bundles in 1992. Ten years later, Oh and Schwarz (independently) adapted the construction to Hamiltonian diffeomorphism groups of quite general manifolds thanks to Floer theory. Since then, spectral invariants were defined in various contexts and yielded a great number of applications of different natures. I will tak about joint work with Frol Zapolsky in which we define spectral invariants for monotone Lagrangians and establish the properties which make them such a useful tool. In particular, given a monotone Lagrangian L, I will show how spectral invariants can be seen as functions defined on the universal cover of the product of the set of Lagrangians Hamiltonian isotopic to L and the Hamiltonian diffeomorphism group. Then, I'll show that these functions are Lipschitz with respect to the natural Hofer distance on this space.         Naef Jan 26, 2017 In this talk, I will explain how for a contact manifold the existence of a dynamically convex supporting contact form ensures compactness of Floer moduli spaces and thus allows us to define Rabinowitz Floer homology in a symplectisation. In this setting, the Rabinowitz Floer homology groups give a means to deduce existence results of translated points as introduced by Sandon. This is joint work with Matthias Meiwes.     Hutchings Jan 26, 2017 We show that every nondegenerate contact form on a closed connected three-manifold, such that the associated contact structure has torsion first Chern class, has either two or infinitely many simple Reeb orbits. (By previous work, two simple Reeb orbits are possible only when the three-manifold is a sphere or a lens space.) Joint work with Dan Cristofaro-Gardiner and Dan Pomerleano.