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

Vertex Operator Algebras and Modular Forms

Posted in
Speaker: 
Matthias Storzer
Zugehörigkeit: 
MPIM
Datum: 
Mit, 2021-05-19 16:15 - 17:45

Meeting-ID: 994 2805 4844
For passcode contact Christian Kaiser (kaiser@mpim...).

Introduction to Vertex Operator Algebras

Posted in
Speaker: 
Kilian Boenisch
Zugehörigkeit: 
MPIM
Datum: 
Mit, 2021-05-12 16:15 - 17:45

Meeting-ID: 994 2805 4844
For passcode contact Christian Kaiser (kaiser@mpim...).

IMPRS seminar on various topics: Vertex Operator Algebras and Monstrous Moonshine

Posted in
Organiser(s): 
Christian Kaiser
Datum: 
Mit, 2021-05-12 16:15 - 17:45

Lecture course "From 3-manifold invariants to number theory"

Posted in
Speaker: 
Don Zagier
Zugehörigkeit: 
MPIM/ICTP
Datum: 
Fre, 2021-05-14 14:00 - 16:00

https://zoom.us/j/96952516566?pwd=Z3NyZW04M2YxSHo2MWdlOHJ4MlNpUT09
Meeting ID: 969 5251 6566
Passcode: 307018

 


      

Lecture course "From 3-manifold invariants to number theory"

Posted in
Speaker: 
Don Zagier
Zugehörigkeit: 
MPIM/ICTP
Datum: 
Mon, 2021-05-10 16:00 - 18:00

https://zoom.us/j/96952516566?pwd=Z3NyZW04M2YxSHo2MWdlOHJ4MlNpUT09
Meeting ID: 969 5251 6566
Passcode: 307018

 


      

Lecture course "From 3-manifold invariants to number theory"

Posted in
Speaker: 
Don Zagier
Zugehörigkeit: 
MPIM/ICTP
Datum: 
Mon, 2021-05-10 16:00 - 18:00

Mondays 4--6 pm   and  Fridays 2--4 pm
 

https://zoom.us/j/96952516566?pwd=Z3NyZW04M2YxSHo2MWdlOHJ4MlNpUT09 Meeting ID: 969 5251 6566 Passcode: 307018


A description of the planned contents of the course can be found here:

https://www.mpim-bonn.mpg.de/node/10791

tba

Posted in
Speaker: 
Lyne Moser
Datum: 
Mon, 2021-06-07 14:30 - 15:00
Parent event: 
MPIM Topology Seminar

Meeting ID: 916 5855 1117
Password: as before.
Contact: Aru Ray, Tobias Barthel,Viktoriya Ozornova
Slides: are attached on the Talk's page or see our Nextcloud
eech lattice. All this will be explained.

tba

Posted in
Speaker: 
Gianluca Faraco
Datum: 
Mon, 2021-06-07 14:00 - 14:20
Parent event: 
MPIM Topology Seminar

Meeting ID: 916 5855 1117
Password: as before.
Contact: Aru Ray, Tobias Barthel,Viktoriya Ozornova
Slides: are attached on the Talk's page or see our Nextcloud
eech lattice. All this will be explained.

Don’t Panic and Always Carry a RAAG

Posted in
Speaker: 
Corey Bregman
Zugehörigkeit: 
University of Southern Maine
Datum: 
Mon, 2021-05-31 15:30 - 16:30
Parent event: 
MPIM Topology Seminar

Meeting ID: 916 5855 1117
Password: as before.
Contact: Aru Ray, Tobias Barthel,Viktoriya Ozornova
Slides: are attached on the Talk's page or see our Nextcloud
 

From flat doughnuts to outer space: a classifying space odyssey

Posted in
Speaker: 
Jean-Pierre Mutanguha
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2021-05-17 14:00 - 15:00
Parent event: 
MPIM Topology Seminar

Meeting ID: 916 5855 1117
Password: as before.
Contact: Aru Ray, Tobias Barthel,Viktoriya Ozornova
Slides: are attached on the Talk's page or see our Nextcloud
 

Coxeter and Art...in groups

Posted in
Speaker: 
Rachael Boyd
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2021-05-10 14:00 - 15:00
Parent event: 
MPIM Topology Seminar

Meeting ID: 916 5855 1117
Password: as before.
Contact: Aru Ray, Tobias Barthel,Viktoriya Ozornova
Slides: are attached on the Talk's page or see our Nextcloud

I will introduce Coxeter and Artin groups with some historical context, and then focus on Right Angled Artin Groups (RAAGs). I will define the Salvetti complex for a given RAAG and show that it is a classifying space for the group using the theory of CAT(0) cube complexes.


 

Shifted powers in Lucas-Lehmer sequences

Posted in
Speaker: 
Vandita Patel
Zugehörigkeit: 
University of Manchester
Datum: 
Mit, 2021-05-12 14:30 - 15:30
Parent event: 
Number theory lunch seminar

 

The explicit determination of perfect powers in (shifted) non-degenerate, integer, binary linear recurrence sequences has only been achieved in a handful of cases. In this talk, we combine bounds for linear forms in logarithms with results from the modularity of elliptic curves defined over totally real fields to explicitly determine all shifted powers by two in the Fibonacci sequence. This is joint work with Mike Bennett (UBC) and Samir Siksek (Warwick).

 

Asymptotics of Restricted Partition Functions

Posted in
Speaker: 
Ayla Gafni
Zugehörigkeit: 
University of Mississippi
Datum: 
Mit, 2021-05-05 14:30 - 15:30
Parent event: 
Number theory lunch seminar

Given a set $\mathcal A \subset \mathbb N$, the restricted partition function $p_{\mathcal{A}} (n)$ counts the number of integer partitions of $n$ with all parts in $\mathcal A$. In this talk, we will explore the features of the restricted partitions function $p_{\mathbb P_k}(n)$ where $\mathcal P_k$ is the set of $k$-th powers of primes. Powers of primes are both sparse and irregular, which makes $p_{\mathbb P_k}(n)$ quite an elusive function to understand.

The energy functional of a Hitchin representation

Posted in
Speaker: 
Ivo Slegers
Zugehörigkeit: 
Universität Bonn
Datum: 
Don, 2021-05-06 16:30 - 18:00

In this talk we will discuss the energy functionals on Teichmüller space that are associated to Hitchin representations. We will show that these functionals are strictly plurisubharmonic functions on Teichmüller space. In the second half of this talk we consider the question whether a Hitchin representation is uniquely determined by its energy functional. We answer a similar question in a simpler setting and
discuss work in progress on how these results can be expanded to include Hitchin representations.

 

Equidistribution of the Fourier coefficients of Hecke cusp forms and applications

Posted in
Speaker: 
Oleksiy Klurman
Zugehörigkeit: 
University of Bristol/MPIM
Datum: 
Mit, 2021-04-28 14:30 - 15:30
Parent event: 
Number theory lunch seminar

I will discuss joint work with A. Mangerel, where we establish a general
joint equidistribution result for the Fourier coefficients of Hecke cusp
forms. One simple to state consequence of such a result is that the set of
integers with, say, $\tau(n+2)<\tau(n+1)<\tau(n)$ where $\tau$ is
the Ramanujan $\tau$-function, has a positive upper density
(previously, even the infinitude of such a set was unknown).

Geometrization of the Hecke algebra

Posted in
Speaker: 
Mingjia Zhang
Zugehörigkeit: 
Universität Bonn/MPIM
Datum: 
Mit, 2021-05-05 16:15 - 17:45

Zoom Meeting-ID: 994 2805 4844
For passcode please contact Christian Kaiser (kaiser@mpim...).

Perverse Sheaves and Morse Theory

Posted in
Speaker: 
Axel Koelschbach
Zugehörigkeit: 
Universität Bonn/MPIM
Datum: 
Mit, 2021-04-28 16:15 - 17:45

Zoom Meeting-ID: 994 2805 4844
For passcode please contact Christian Kaiser (kaiser@mpim...).

Formalism of Perverse Sheaves

Posted in
Speaker: 
Gregory Andreychev
Zugehörigkeit: 
Universität Bonn/MPIM
Datum: 
Mit, 2021-04-21 16:15 - 17:45

Zoom Meeting-ID: 994 2805 4844
For passcode please contact Christian Kaiser (kaiser@mpim...).

Maxima of a Random Model of the Riemann Zeta Function over Intervals of Varying Length

Posted in
Speaker: 
Lisa Hartung
Zugehörigkeit: 
Universität Mainz
Datum: 
Mit, 2021-04-21 14:30 - 15:30
Parent event: 
Number theory lunch seminar

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

Is freeness enough for counting rational points?

Posted in
Speaker: 
Will Sawin
Zugehörigkeit: 
Columbia University
Datum: 
Die, 2021-05-25 14:00 - 15:30

Manin's conjecture predicts the number of rational points of bounded height on a Fano variety, but for the predictions to hold, we must first remove a "thin set" consisting of rational points lying on certain special subvarieties and lifting to certain special covering spaces. It might be better if we could instead identify the bad rational points to remove by their intrinsic geometry. It may seem that rational points do not have any intrinsic geometry, but recently Peyre has given two proposals to do this, one measuring the freeness of a point and the other using all the heights.

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