Kommende Vorträge

Ausführliche Liste aller demnächst stattfindenden Vorträge und Seminare. Für eine Übersicht konsultieren Sie bitte auch den Kalender [2].

Oberseminar Arithmetic Geometry and Representation Theory [3]

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Vortrag [4]

Organiser(s):

Prof. Dr. J. Fintzen, Prof. Dr. T. Kaletha, Prof. Dr. P. Scholze

Datum:

Fre, 11/10/2024 - 14:05 - Fre, 19/12/2025 - 16:00

Location:

MPIM Lecture Hall [5]

Details:

Program [6] and Abstracts [7] of Oberseminar Arithmetic Geometry and Representation Theory

https://people.mpim-bonn.mpg.de/scholze/veranstaltungen.html

Positivity of Gromov simplicial volume of non-positively curved 4-manifolds. [8]

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Vortrag [4]

Speaker:

Inkang Kim

Zugehörigkeit:

KIAS/MPIM

Datum:

Mon, 14/07/2025 - 14:00 - 15:00

Location:

MPIM Lecture Hall [5]

Parent event:

MPIM Topology Seminar [9]

We show that a closed non-positively curved 4-manifold with negative Ricci curvature has positive Gromov's simplicial volume.

Metric ribbon graphs [10]

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Vortrag [4]

Speaker:

Ivan Yakovlev

Zugehörigkeit:

MPIM

Datum:

Die, 15/07/2025 - 11:00 - 12:00

Location:

MPIM Lecture Hall [5]

Parent event:

Low-dimensional topology seminar [11]

Metric ribbon graphs (MRG) are graphs embedded into surfaces equipped with positive edge lengths. Functions counting MRG's with given boundary lengths are a priori piecewise polynomials, but in some cases become honest polynomials.

I will first present one such case -- Kontsevich's polynomials counting trivalent MRG's (from his proof of Witten's conjecture about intersection numbers on the moduli spaces of curves), and explain how they are used to study hyperbolic and flat surfaces.

Weiterlesen [10]

Sharp mixed moment bounds for zeta times a Dirichlet L-function [12]

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Vortrag [4]

Speaker:

Markus Hagen

Zugehörigkeit:

NTNU

Datum:

Die, 15/07/2025 - 16:30 - 17:30

Location:

MPIM Lecture Hall [5]

Parent event:

PLeaSANT (Participative Learning Seminar on Any Number Theory) [13]

A famous theorem of Selberg asserts that $\log|\zeta(\tfrac12+it)|$ is approximately a normal distribution with mean $0$ and variance $\tfrac12\log\log T$, when we sample $t\in [T,2T]$ uniformly.

Weiterlesen [12]

Condensable Topological Defects in 4D Dijkgraaf-Witten models—Classification of Fusion 2-Categorical Symmetries [14]

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Vortrag [4]

Speaker:

Hao Xu

Zugehörigkeit:

Göttingen

Datum:

Mit, 16/07/2025 - 10:30 - 12:00

Location:

MPIM Lecture Hall [5]

Parent event:

Higher Differential Geometry Seminar [15]

Given a finite group $G$ a 4-cocycle $\pi \in \mathrm{H}^4(G,U(1))$, the 4D Dijkgraaf–Witten model provides an exactly solvable gauge theory with applications in high-energy physics and topological phases of matter. The topological defects in this model form a braided fusion 2-category $\mathscr{Z}(\mathbf{2Vect}^\pi_G)$, the Drinfeld center of $\pi$-twisted $G$-crossed finite semisimple linear categories.

Weiterlesen [14]

Hyperbolic Counting and Equidistribution [16]

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Vortrag [4]

Speaker:

Marios Voskou

Zugehörigkeit:

MPIM

Datum:

Mit, 16/07/2025 - 14:30 - 15:30

Location:

MPIM Lecture Hall [5]

Parent event:

Number theory lunch seminar [17]

In Euclidean space, the Gauss Circle Problem concerns estimating the number of lattice points inside a Euclidean circle. In this talk, we examine analogous problems in the hyperbolic plane, approached through the lens of the spectral theory of automorphic forms. We also highlight arithmetic applications, particularly the distribution of ideals in number fields.

Khovanov skein lasagna modules with 1-dimensional inputs [18]

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Vortrag [4]

Speaker:

Qiuyu Ren

Zugehörigkeit:

UC Berkeley

Datum:

Don, 17/07/2025 - 11:00 - 12:00

Location:

MPIM Lecture Hall [5]

Parent event:

Low-dimensional topology seminar [11]

Skein lasagna modules (with 0-dimensional inputs) are 4-manifold invariants introduced by Morrison-Walker-Wedrich. In this context, a skein is a properly embedded surface in a 4-manifold minus a disjoint union of 4-balls, and the lasagna comes from a TQFT for links in S^3 (satisfying mild conditions).

Weiterlesen [18]

Non-displaceable Lagrangians in certain Hamiltonian $T$-manifolds [19]

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Vortrag [4]

Speaker:

Yao XIao

Zugehörigkeit:

MPIM

Datum:

Don, 17/07/2025 - 12:45 - 13:45

Location:

Lipschitz-Saal, Center for Mathematics Bonn [20]

Parent event:

Bonn symplectic geometry seminar [21]

We will discuss how to find Lagrangian submanifolds that are non-displaceable under Hamiltonian diffeomorphisms in certain manifolds with Hamiltonian torus actions, using Lagrangian Floer theory and its equivariant version. The case of compact toric manifolds will be reviewed.

Degeneration of Kähler polarisations associated to imaginary-time flow [22]

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Vortrag [4]

Speaker:

Dan Wang

Zugehörigkeit:

MPIM

Datum:

Don, 17/07/2025 - 15:00 - 16:00

Location:

MPIM Lecture Hall [5]

Parent event:

MPI-Oberseminar [23]

Geometric quantization on symplectic manifolds plays an important role in representation theory and mathematical physics, and is deeply related to symplectic and differential geometry. A crucial problem is to understand the relationships among geometric quantizations associated with different polarizations. In this talk, we will discuss the existence of mixed polarizations and degeneration of Kähler polarizations associated to imaginary-time flow.

Zero entropy on entire Grauert tubes [24]

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Vortrag [4]

Speaker:

Pablo Suarez-Serrato

Zugehörigkeit:

UNAM/MPIM

Datum:

Don, 17/07/2025 - 16:30 - 17:00

Location:

MPIM Lecture Hall [5]

Parent event:

Summer Geometry Day [25]