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Spring Semester 2025

Date / Time Speaker Title Location
24 February 2025
15:15-16:30 		Erman Çineli
ETH
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Symplectic Geometry Seminar

Title Closed orbits of dynamically convex Reeb flows
Speaker, Affiliation Erman Çineli, ETH
Date, Time 24 February 2025, 15:15-16:30
Location HG G 43
Abstract In this talk we will discuss two results on the multiplicity problem for prime closed orbits of dynamically convex Reeb flows on the boundary of a star-shaped domain in R2n. The first result asserts that such a flow has at least n prime closed Reeb orbits, improving the previously known lower bound by a factor of two. The second main theorem is that when, in addition, the domain is centrally symmetric and the Reeb flow is non-degenerate, the flow has either exactly n or infinitely many prime closed orbits. This is a joint work with Basak Gurel and Viktor Ginzburg.
Closed orbits of dynamically convex Reeb flowsread_more
HG G 43
3 March 2025
15:15-16:30 		Felix Schlenk
Neuchâtel University
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Symplectic Geometry Seminar

Title Singular polarizations of open symplectic 4-manifolds, with applications
Speaker, Affiliation Felix Schlenk, Neuchâtel University
Date, Time 3 March 2025, 15:15-16:30
Location HG G 43
Abstract Twenty five years ago, Paul Biran introduced polarizations of closed symplectic manifolds and showed that their Lagrangian skeleta exhibit remarkable rigidity properties. He in particular found that their complements contain only small balls. I will introduce similar polarizations of certain open 4-dimensional symplectic manifolds. This leads to several symplectic embedding results, that in turn lead to new Lagrangian non-removable intersections and a novel phenomenon of Legendrian barriers. For instance, given any connected symplectic 4-manifold $(M,\omega)$ and a 4-ball of smaller volume, their exists an explicit finite union of Lagrangian discs in the 4-ball such that their complement symplectically embeds into~$(M,\omega)$, extending a result by Sackel--Song--Varolgunes--Zhu and Brendel. Other applications are new Lagrangian intersection results and relative versions of the Arnold chord conjecture. The talk will be non-technical and focus on the geometric constructions. This is joint work with Emmanuel Opshtein.
Singular polarizations of open symplectic 4-manifolds, with applicationsread_more
HG G 43
10 March 2025
15:15-16:15 		Rohil Prasad
UC Berkeley
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Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Rohil Prasad, UC Berkeley
Date, Time 10 March 2025, 15:15-16:15
Location HG G 43
Title T.B.A.
HG G 43
24 March 2025
15:15-16:30 		Laurent Côté
University of Bonn
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Laurent Côté, University of Bonn
Date, Time 24 March 2025, 15:15-16:30
Location HG G 43
Title T.B.A.
HG G 43
31 March 2025
22:31-23:31 		Umut Varolgunes
Koç University
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Umut Varolgunes, Koç University
Date, Time 31 March 2025, 22:31-23:31
Location HG G 43
Title T.B.A.
HG G 43
7 April 2025
22:31-23:31
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation
Date, Time 7 April 2025, 22:31-23:31
Location HG G 43
Title T.B.A.
HG G 43
14 April 2025
22:31-23:31 		Marcelo Alves
University of Antwerp
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Marcelo Alves, University of Antwerp
Date, Time 14 April 2025, 22:31-23:31
Location HG G 43
Title T.B.A.
HG G 43
5 May 2025
15:15-16:15 		Noah Porcelli
Imperial College London, United Kingdom
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Noah Porcelli, Imperial College London, United Kingdom
Date, Time 5 May 2025, 15:15-16:15
Location HG G 43
Title T.B.A.
HG G 43
12 May 2025
15:15-16:15 		Filip Broćić
Universität Augsburg, Germany
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Filip Broćić, Universität Augsburg, Germany
Date, Time 12 May 2025, 15:15-16:15
Location HG G 43
Title T.B.A.
HG G 43
19 May 2025
15:15-16:30 		Joel Schmitz
Université de Neuchâtel
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation Joel Schmitz, Université de Neuchâtel
Date, Time 19 May 2025, 15:15-16:30
Location HG G 43
Title T.B.A.
HG G 43
26 May 2025
15:15-16:30
Details

Symplectic Geometry Seminar

Title Title T.B.A.
Speaker, Affiliation
Date, Time 26 May 2025, 15:15-16:30
Location HG G 43
Title T.B.A.
HG G 43

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