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Herbstsemester 2024

Datum / Zeit Referent:in Titel Ort
* 2. Oktober 2024
15:30-16:30 		Prof. Dr. Sobhan Seyfaddini
ETH Zurich, Switzerland
Details

Geometry Seminar

Titel On the algebraic structure of area preserving homeomorphisms of the sphere
Referent:in, Affiliation Prof. Dr. Sobhan Seyfaddini, ETH Zurich, Switzerland
Datum, Zeit 2. Oktober 2024, 15:30-16:30
Ort HG G 19.1
On the algebraic structure of area preserving homeomorphisms of the sphere
HG G 19.1
9. Oktober 2024
15:30-16:30 		Alexander Dranishnikov
University of Florida
Details

Geometry Seminar

Titel On Gromov's Positive Scalar Curvature Conjecture for RAAGs
Referent:in, Affiliation Alexander Dranishnikov, University of Florida
Datum, Zeit 9. Oktober 2024, 15:30-16:30
Ort HG G 43
Abstract Gromov's PSC conjecture for a discrete group G states that the universal cover of a closed PSC n-manifold with the fundamental group G has the macroscopic dimension less than or equal to n-2. We prove Gromov's conjecture for right-angled Artin groups (RAAGs).
On Gromov's Positive Scalar Curvature Conjecture for RAAGsread_more
HG G 43
16. Oktober 2024
15:30-16:30 		Prof. Dr. Thomas Mettler
UniDistance Suisse
Details

Geometry Seminar

Titel Flat extensions of principal connections and the Chern—Simons 3-form
Referent:in, Affiliation Prof. Dr. Thomas Mettler, UniDistance Suisse
Datum, Zeit 16. Oktober 2024, 15:30-16:30
Ort HG G 43
Abstract I will introduce the notion of a flat extension of a connection on a principal bundle. Roughly speaking, a connection admits a flat extension if it arises as the pull-back of a component of a Maurer–Cartan form. For trivial bundles over closed oriented 3-manifolds, I will relate the existence of certain flat extensions to the vanishing of the Chern–Simons invariant associated to the connection. Joint work with Andreas Cap & Keegan Flood.
Flat extensions of principal connections and the Chern—Simons 3-formread_more
HG G 43
23. Oktober 2024
15:30-16:30 		Francesco Fournier-Facio
University of Cambridge
Details

Geometry Seminar

Titel Bounded cohomology of transformation groups of R^n
Referent:in, Affiliation Francesco Fournier-Facio, University of Cambridge
Datum, Zeit 23. Oktober 2024, 15:30-16:30
Ort HG G 43
Abstract Bounded cohomology is a functional analytic analogue of group cohomology, with many applications in rigidity theory, geometric group theory, and geometric topology. A major drawback is the lack of excision, and because of this some basic computations are currently out of reach; in particular the bounded cohomology of some “small” groups, such as the free group, is still mysterious. On the other hand, in the past few years full computations have been carried out for some “big” groups, most notably transformation groups of R^n, where the ordinary cohomology is not yet completely understood. I will report on this recent progress, which will include joint work with Caterina Campagnolo, Yash Lodha and Marco Moraschini, and joint work with Nicolas Monod, Sam Nariman and Sander Kupers.
Bounded cohomology of transformation groups of R^nread_more
HG G 43
13. November 2024
15:30-16:30 		John Baldwin
Boston College
Details

Geometry Seminar

Titel Title T.B.A.
Referent:in, Affiliation John Baldwin, Boston College
Datum, Zeit 13. November 2024, 15:30-16:30
Ort HG G 43
Title T.B.A.
HG G 43
20. November 2024
15:30-16:30 		Ben Lowe
University of Chicago
Details

Geometry Seminar

Titel Finiteness of Totally Geodesic Hypersurfaces in Negative Curvature
Referent:in, Affiliation Ben Lowe, University of Chicago
Datum, Zeit 20. November 2024, 15:30-16:30
Ort HG G 43
Abstract There is a broad body of work devoted to proving theorems of the following form: spaces with infinitely many special sub-spaces are either nonexistent or rare. Such finiteness statements are important in algebraic geometry, number theory, and the theory of moduli space and locally symmetric spaces. I will talk about joint work with Simion Filip and David Fisher proving a finiteness statement of this kind in a differential geometry setting. Our main theorem is that a closed negatively curved analytic Riemannian manifold with infinitely many closed totally geodesic hypersurfaces must be isometric to an arithmetic hyperbolic manifold. The talk will be more focused on providing background and context than details of proofs and should be accessible to a general audience.
Finiteness of Totally Geodesic Hypersurfaces in Negative Curvatureread_more
HG G 43
27. November 2024
15:30-16:30 		Michelle Bucher
Université de Genève
Details

Geometry Seminar

Titel Title T.B.A.
Referent:in, Affiliation Michelle Bucher, Université de Genève
Datum, Zeit 27. November 2024, 15:30-16:30
Ort HG G 43
Title T.B.A.
HG G 43
4. Dezember 2024
15:30-16:30 		Xenia Flamm
IHES
Details

Geometry Seminar

Titel Title T.B.A.
Referent:in, Affiliation Xenia Flamm, IHES
Datum, Zeit 4. Dezember 2024, 15:30-16:30
Ort HG G 43
Title T.B.A.
HG G 43
11. Dezember 2024
15:30-16:30 		Mikolaj Fraczyk
Jagiellonian University, Krakow
Details

Geometry Seminar

Titel Title T.B.A.
Referent:in, Affiliation Mikolaj Fraczyk, Jagiellonian University, Krakow
Datum, Zeit 11. Dezember 2024, 15:30-16:30
Ort HG G 43
Title T.B.A.
HG G 43

Hinweise: das hervorgehobene Ereignis markiert das nächste eintretende Ereignis und mit einem Stern gekennzeichnete Ereignisse (*) zeigen an, dass die Zeit und/oder der Ort von der üblichen Zeit und/oder dem üblichen Ort abweichen.

Organisatoren:innen: Marc Burger, Manfred Einsiedler, Urs Lang, Lukas Lewark, Christian Urech

Archiv: HS 24 FS 24 HS 23 FS 23 HS 22 FS 22 HS 21 HS 20 FS 20 HS 19 FS 19 HS 18 FS 18 HS 17 FS 17 HS 16 FS 16 HS 15 FS 15 HS 14 FS 14 HS 13 FS 13 HS 12 FS 12 HS 11 FS 11 HS 10 FS 10 HS 09 FS 09

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