Skip to main content

Talk

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

tba

Posted in
Speaker: 
Gereon Quick
Zugehörigkeit: 
NTNU Oslo
Datum: 
Die, 2021-03-23 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

tba

Posted in
Speaker: 
Thomas Willwacher
Zugehörigkeit: 
ETH Zürich
Datum: 
Die, 2021-03-09 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

tba

Posted in
Speaker: 
Karim Adiprasito
Zugehörigkeit: 
Hebrew University of Jerusalem
Datum: 
Die, 2021-02-09 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

tba

Posted in
Speaker: 
Tomáš Procházka
Zugehörigkeit: 
LMU München
Datum: 
Die, 2021-02-02 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

tba

Posted in
Speaker: 
Bruno Klingler
Zugehörigkeit: 
HU Berlin
Datum: 
Die, 2021-01-26 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

tba

Posted in
Speaker: 
Alice Guionnet
Zugehörigkeit: 
ENS Lyon
Datum: 
Die, 2021-01-19 14:00 - 15:30

tba

online  https://bbb.mpim-bonn.mpg.de/b/gae-a7y-hhd

The image of J in the Adams Spectral Sequence

Posted in
Speaker: 
Bertram Arnold
Zugehörigkeit: 
MPIM
Datum: 
Don, 2020-12-10 14:15 - 15:45

Meeting ID: 974 6894 7515
For passcode contact Christian Kaiser (kaiser@mpim...).

Four-dimensional topological quantum field theories

Posted in
Speaker: 
David Reutter
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2020-12-07 14:30 - 14:50
Parent event: 
MPIM Topology Seminar

Zoom Meeting ID: 916 5855 1117
For password contact: Arunima Ray or Tobias Barthel.

I will give an introductory overview of some examples of 4-dimensional topological quantum field theories
coming from quantum topology, and discuss how certain algebraic properties of their input data determine
their sensitivity to homeomorphism type and smooth structure.

The doubly slice genus of knots

Posted in
Speaker: 
Mark Powell
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2020-12-07 14:00 - 14:20
Parent event: 
MPIM Topology Seminar

Zoom Meeting ID: 916 5855 1117
For password contact: Arunima Ray or Tobias Barthel.

The doubly slice genus of a knot is a relatively new, natural 4-dimensional knot invariant.
I will describe what is known about it, including an excellent theorem of Wenzhao Chen and
joint work of mine with Patrick Orson.



 

Bivariant intersection theory for stacks and weak Alexander schemes

Posted in
Speaker: 
Pim Spelier
Zugehörigkeit: 
Leiden University
Datum: 
Mon, 2020-12-21 10:30 - 12:00

tba

Bivariant intersection theory

Posted in
Speaker: 
Campbell Wheeler
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2020-12-14 10:30 - 12:00

tba

Defining intersection theory on stacks

Posted in
Speaker: 
Reinier Kramer
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2020-12-07 10:30 - 12:00

Using the machinery of both the summer and the fall parts of this reading group, I will define intersection theory
on (Deligne-Mumford) stacks, using Vistoli's paper. I will commence by developing structural properties of stacks, such as
the degree of a morphism. Furthermore, I will define a weak notion of moduli space for DM stacks, and go on to define
intersection theory on stacks and prove naturality properties.

 

https://bbb.mpim-bonn.mpg.de/b/rei-xh2-kg6
For password please email to rkramer@mpim...


      

Universal norms of p-adic Galois representations and the Fargues-Fontaine curve

Posted in
Speaker: 
Gautier Ponsinet
Zugehörigkeit: 
MPIM
Datum: 
Die, 2020-12-15 14:00 - 15:30

In 1996, Coates and Greenberg computed explicitly the module of universal norms associated with an abelian variety in a perfectoid field extension. The computation of this module is essential to Iwasawa theory, notably to prove "control theorems" for Selmer groups generalising Mazur's foundational work on the Iwasawa theory of abelian varieties over Z_p-extensions. Coates and Greenberg then raised the natural question on possible generalisations of their result to general motives.

Skein modules of closed 3-manifolds

Posted in
Speaker: 
Renaud Detcherry
Zugehörigkeit: 
Dijon
Datum: 
Die, 2020-12-08 14:00 - 15:30

https://hu-berlin.zoom.us/j/83613559205?pwd=aGtJTWcwWHdRaUxEV1NyVUptVVFUUT09
Meeting ID: 836 1355 9205
Password: 120672
 

The dual Steenrod Algebra and sample computations in the Adams Spectral Sequence

Posted in
Speaker: 
Luuk Stehouwer
Zugehörigkeit: 
MPIM
Datum: 
Don, 2020-12-03 14:15 - 15:45

Meeting ID: 974 6894 7515
For passcode see the email or contact Christian Kaiser (kaiser@mpim...).

Random Models for Artin Twin Primes

Posted in
Speaker: 
Ezra Waxman
Zugehörigkeit: 
TU Dresden
Datum: 
Mit, 2020-12-02 14:30 - 15:30
Parent event: 
Number theory lunch seminar

We say that a prime number p is an Artin prime for g if g is a primitive root mod p. For appropriately chosen integers g and d, we present a conjecture for the asymptotic number of prime pairs (p,p+d) such that both p and p+d are Artin primes for g. Our result suggests that the distribution of Artin prime pairs, amongst the ordinary prime pairs, is largely governed by a Poisson process. (Joint work with Magdaléna Tinková and Mikuláš Zindulka).

tba

Posted in
Speaker: 
Nuno Freitas
Zugehörigkeit: 
Universidad de Barcelona/MPIM
Datum: 
Mit, 2020-12-16 14:30 - 15:30
Parent event: 
Number theory lunch seminar

Zoom Online Meeting ID: 919 6497 4060
For password see the email or contact Pieter Moree (moree@mpim...).

Separation of periods of quartic surfaces

Posted in
Speaker: 
Emre Sertöz
Zugehörigkeit: 
MPIM
Datum: 
Mit, 2020-12-09 14:30 - 15:30
Parent event: 
Number theory lunch seminar

Kontsevich--Zagier periods form a natural number system that extends the
algebraic numbers by adding constants coming from geometry and physics.
Because there are countably many periods, one would expect it to be
possible to compute effectively in this number system. This would require
an effective height function and the ability to separate periods of bounded
height, neither of which are currently possible.

In this talk, we introduce an effective height function for periods of quartic
surfaces defined over algebraic numbers. We also determine the

Representing handlebody groups

Posted in
Speaker: 
Lukas Mueller
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2020-11-30 14:30 - 14:50
Parent event: 
MPIM Topology Seminar
I will describe the construction of handlebody group representations from representation theoretical quantities such as the representation category of certain Hopf algebras. The talk will focus on how the topology 'determines' the relevant algebraic structure.
 
Meeting ID: 916 5855 1117
Password: as before.
 
Contact: Aru Ray and Tobias Barthel

 

The Borel Conjecture and aspherical 4-manifolds

Posted in
Speaker: 
Jim Davis
Zugehörigkeit: 
Indiana University, Bloomington/MPIM
Datum: 
Mon, 2020-11-30 14:00 - 14:20
Parent event: 
MPIM Topology Seminar

A space is aspherical if its universal cover is contractible.   Obstruction theory shows that any two aspherical CW complexes with isomorphic fundamental groups are homotopy equivalent.   The Borel Conjecture states that any two closed aspherical manifolds with isomorphic fundamental groups are homeomorphic.    The Borel Conjecture for manifolds with boundary states that two aspherical compact manifolds with isomorphic fundamental groups and homeomorphic boundaries are in fact homeomorphic.

© MPI f. Mathematik, Bonn Impressum & Datenschutz
-A A +A
Inhalt abgleichen