Home

Talk

Talks and seminars, possibly part of a conference or series.

Hyperbolic Localization and Second Adjointness

Posted in
Speaker: 
Lucas Mann
Affiliation: 
Universität Münster
Date: 
Fri, 11/07/2025 - 14:05 - 16:00
Location: 
MPIM Seminar Room
Parent event: 
Oberseminar Arithmetic Geometry and Representation Theory

Following an idea of Drinfeld, we present an abstract proof of Braden's
result on hyperbolic localization, relating sheaves on a space with
$\mathbb G_m$-action to their restriction to the attractor, repeller and
fixed point locus. Our argument is purely formal and works in an
abstract setting, and it roughly reduces the general statement to the
base case of $\mathbb G_m$ acting on $\mathbb A^1$.  This allows us to

tba

Posted in
Speaker: 
Honglei Lang
Affiliation: 
Chinese Agricultural University
Date: 
Wed, 23/07/2025 - 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Higher Differential Geometry Seminar

tba

Posted in
Speaker: 
Hao Xu
Affiliation: 
Göttingen
Date: 
Wed, 16/07/2025 - 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Higher Differential Geometry Seminar

A sketch of the proof of modularity of abelian surfaces

Posted in
Speaker: 
Juan Esteban Rodriguez Camargo
Affiliation: 
MPIM
Date: 
Mon, 07/07/2025 - 14:00 - 16:00
Location: 
Center for Mathematics Bonn
Parent event: 
ARGOS (Arithmetische Geometrie Oberseminar)

Venue: Endenicher Allee 60, Room 1.007, Math. Center, University of Bonn

Quantum groups and recovering Jones and HOMFLY

Posted in
Speaker: 
Lukas Bonfert
Affiliation: 
MPIM/Universität Bonn
Date: 
Fri, 11/07/2025 - 10:15 - 11:45
Location: 
MPIM Seminar Room
Parent event: 
IMPRS seminar on various topics: Quantum knot invariants

Habiro Cohomology

Posted in
Speaker: 
Peter Scholze
Affiliation: 
MPIM
Date: 
Fri, 11/07/2025 - 12:00 - 13:30
Location: 
MPIM Seminar Room
Parent event: 
Vorlesung Selected Topics in Algebraic Geometry: Habiro Cohomology

(33èmes Journées Arithmétiques) Wild Betti sheaves

Posted in
Speaker: 
Peter Scholze
Affiliation: 
MPIM
Date: 
Thu, 03/07/2025 - 10:45 - 11:45
Location: 
MPIM Lecture Hall
Parent event: 
Extra talk

Plenary talk at the conference "33èmes Journées Arithmétiques", Luxembourg:
https://www.uni.lu/fstm-en/conferences/ja25/

This talk will be streamed from the MPIM lecture hall, Bonn. 

(Seminar SAG) On the exceptional locus of O’Grady’s nonsymplectic resolutions

Posted in
Speaker: 
Luigi Martinelli
Affiliation: 
Bielefeld
Date: 
Thu, 10/07/2025 - 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Seminar Algebraic Geometry (SAG)

In this talk, we focus on some singular moduli spaces of sheaves on a K3 surface. More precisely, for any integer n > 1, we consider the moduli space M(n) associated with the Mukai vector 2(1,0,1-n). Looking for new deformation classes of hyper-Kähler manifolds, O’Grady constructed an explicit resolution of every M(n). O’Grady’s resolution is crepant and does give a hyper-Kähler manifold only if n=2. If n>2, it turns out that no crepant resolution exists for M(n), but one may still look for a categorical crepant resolution.

(LDT seminar) Non-flexible loops of loose Legendrians in 3 dimensions

Posted in
Speaker: 
Eduardo Fernandez 
Affiliation: 
University of Georgia
Date: 
Tue, 01/07/2025 - 11:00 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Low-dimensional topology seminar

In recent years, significant progress has been made in understanding families of Legendrians in 3-dimensional contact topology. For instance, the homotopy type of the component of the max-tb Legendrian unknot (or any algebraic link) in the standard contact 3-sphere is now completely understood. However, the existence of non-flexible families of Legendrians has remained an open question. In this talk, we will explore this question in the context of loops of Legendrians.

Reshetikhin-Turaev invariants

Posted in
Speaker: 
Ferdinand Wagner
Affiliation: 
MPIM/Universität Bonn
Date: 
Fri, 04/07/2025 - 10:15 - 11:45
Location: 
MPIM Seminar Room
Parent event: 
IMPRS seminar on various topics: Quantum knot invariants

Q&A on Lagrangians, Quilts, and Moduli Spaces

Posted in
Speaker: 
Katrin Wehrheim
Affiliation: 
UC Berkeley/MPIM
Date: 
Thu, 26/06/2025 - 12:45 - 13:45
Location: 
MPIM Lecture Hall
Parent event: 
Bonn symplectic geometry seminar

We will collect questions and then decide on one or two topics to discuss in more depth.

A categorification of Quinn's finite total homotopy TQFT with application to TQFTs and once-extended TQFTs derived from discrete higher gauge theory

Posted in
Speaker: 
João Faria Martins
Affiliation: 
University of Leeds
Date: 
Tue, 08/07/2025 - 16:45 - 17:45
Location: 
MPIM Lecture Hall
Parent event: 
Twinned workshop on "Quantum Field Theory and Topological Phases via Homotopy Theory and Operator Algebras"

Quinn's Finite Total Homotopy TQFT is a topological quantum field theory defined for any dimension n of space, depending on the choice of a homotopy finite space B. For instance, B can be the classifying space of a finite group or a finite 2-group.

Local-global compatibility at l = p over CM fields (Oberseminar Arithm. Geometry and Representation Theory)

Posted in
Speaker: 
Lambert A'Campo
Affiliation: 
MPIM
Date: 
Fri, 04/07/2025 - 14:05 - 16:00
Location: 
MPIM Seminar Room
Parent event: 
Oberseminar Arithmetic Geometry and Representation Theory

In joint work in progress with Hevesi, Thorne and Whitmore we prove that the global Galois representations associated with cuspidal, cohomological automorphic representations are compatible with the (semisimplified) local Langlands correspondence. In this talk I will explain the context and meaning of this statement. Moreover, I will sketch the proof of the main new technical ingredient, which is a uniform bound on the torsion in the cohomology of certain unitary Shimura varieties.

 

Vorlesung: Habiro Cohomology

Posted in
Speaker: 
Peter Scholze
Affiliation: 
MPIM
Date: 
Fri, 04/07/2025 - 12:00 - 13:30
Location: 
MPIM Seminar Room
Parent event: 
Vorlesung Selected Topics in Algebraic Geometry: Habiro Cohomology

(ARGOS seminar) The Cousin maps and relation with the Sen operator

Posted in
Speaker: 
Tim Kuppel
Affiliation: 
Universität Bonn
Date: 
Mon, 30/06/2025 - 14:00 - 16:00
Location: 
Center for Mathematics Bonn
Parent event: 
ARGOS (Arithmetische Geometrie Oberseminar)

Venue: Endenicher Allee 60, Room 1.007, Math. Center, University of Bonn

Global formality for embeddings of varieties

Posted in
Speaker: 
Alexander Vitanov
Affiliation: 
IHES
Date: 
Wed, 25/06/2025 - 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Higher Differential Geometry Seminar

I will discuss a joint work in progress with Damien Calaque aimed at globalizing a local formality result by Calaque-Felder-Ferrario-Rossi.

Lectures on The interrelation between Hilbert’s Tenth Problem and arithmetic geometry

Posted in
Speaker: 
Carlo Pagano
Affiliation: 
Concordia University/MPIM
Date: 
Thu, 05/06/2025 - 10:30 - 12:00
Location: 
MPIM Seminar Room
Parent event: 
IMPRS Mini course on "The interrelation between Hilbert’s Tenth Problem and arithmetic geometry"

Lectures 3 & 4 by Carlo 

Local to Global results in Floer theory from neck-stretching

Posted in
Speaker: 
Soham Chanda
Affiliation: 
University of Southern California/MPIM
Date: 
Mon, 23/06/2025 - 14:40 - 14:55
Location: 
MPIM Lecture Hall
Parent event: 
MPIM Topology Seminar
Floer theoretic invariants have been a very powerful tool in symplectic geometry which involves `counting' pseudo-holomorphic curves. Obtaining local-to-global principles in Floer theory has remained quite hard because of dealing with moduli spaces of pseudoholomorphic curves. I will explain the heuristic of neck-stretching to obtain local-to-global results in Floer theory and review some recent successful applications of the heuristic.


 

 

Deformations of log-symplectic forms

Posted in
Speaker: 
Mykola Matviichuk
Affiliation: 
Imperial College London/MPIM
Date: 
Mon, 23/06/2025 - 14:20 - 14:35
Location: 
MPIM Lecture Hall
Parent event: 
MPIM Topology Seminar

By a log-symplectic form I mean a meromorphic closed non-degenerate 2-form omega on a complex manifold X that has only simple poles along a divisor D. I will discuss how the de Rham class of omega in H^2(X\D) determines the deformations of the triple (X,D,omega). Some open problems about topology of the divisor deforming D will be discussed.

Double ∞-categories

Posted in
Speaker: 
Jaco Ruit
Affiliation: 
Universiteit Utrecht/MPIM
Date: 
Mon, 23/06/2025 - 14:00 - 14:15
Location: 
MPIM Lecture Hall
Parent event: 
MPIM Topology Seminar

I will give a leisurely introduction to double ∞-categories, provide a range of examples, and explain why these structures are useful. In particular, I will sketch how they play a key role in an abstract framework that systematically develops different generalizations of ∞-category theories (like equivariant and enriched versions). This was part of my PhD thesis.

long format
© MPI f. Mathematik, Bonn Impressum & Datenschutz
-A A +A
Syndicate content