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MPI-Oberseminar

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Organiser(s): 
C. Kaiser
Date: 
Thu, 2013-01-31 15:00 - Thu, 2026-12-31 16:00
Location: 
MPIM Lecture Hall

The Oberseminar is a very long running seminar at MPI (‘Ober‘ standing for 'upper'). Its idea is that the guests of the MPI speak in this seminar (hopefully early in their stay) and get the chance to explain their work to the other guests.

Friedrich Hirzebruch Lecture

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Location: 
University Club Bonn

The annual Friedrich Hirzebruch Lecture is a series of lectures started in 2007 on the occasion of the 80th birthday of Prof. Friedrich Hirzebruch. The lectures address a general audience and aim at illustrating the relation between mathematics and art, society and other fields.

Twinned Conference on Homotopy Theory with Applications to Arithmetic and Geometry

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Date: 
Mon, 2022-06-27 08:00 - Thu, 2022-06-30 16:00

Twinned Conference on Homotopy Theory with Applications to Arithmetic and Geometry, June 27 - 30, 2022

The field of homotopy theory originated in the study of topological spaces up to deformation, but has since been applied effectively in several other disciplines. Indeed, homotopical ideas lead to the resolution of several long-standing open conjectures, for instance on smooth structures on spheres, the moduli of curves, and the cohomology of fields. More recently, Bhatt, Morrow, and Scholze used homotopical methods to compare different cohomology theories for algebraic varieties, thereby resolving open questions in arithmetic geometry. In a similarly arithmetic vein, Galatius and Venkatesh initiated the study of Galois representations with homotopical means, whereas Clausen and Scholze revisited the foundations of analytic topology. These and other recent developments in the interface of arithmetic and topology opened up new lines of attack towards classical open questions, which sparked a wide range of current research activities. This conference intends to survey some of the most spectacular recent advances in the fields, thereby paving the way to new developments and future interactions. Our goal is to foster scientific exchange and collaboration between established researchers, emerging leaders, early career mathematicians, and graduate students.

A sparse equidistribution problem for expanding horocycles on the modular surface

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Speaker: 
Claire Burrin
Affiliation: 
ETHZ/z. Z. HIM
Date: 
Wed, 2021-08-18 14:30 - 15:30
Parent event: 
Number theory lunch seminar

The orbits of the horocycle flow on hyperbolic surfaces are classified: each orbit is either dense or a closed horocycle around a cusp. Expanding closed horocycles are themselves asymptotically dense, and in fact become equidistributed on the surface. The precise rate of equidistribution is of interest; on the modular surface, Zagier observed that a particular rate is equivalent to the Riemann hypothesis being true. I will discuss the asymptotic behavior of evenly spaced points along an expanding closed horocycle. This is based on joint work with Uri Shapira and Shucheng Yu.

Braid varieties and algebraic weaves

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Speaker: 
Jose Simental Rodriguez
Affiliation: 
MPIM
Date: 
Thu, 2021-08-12 15:00 - 16:00
Parent event: 
MPI-Oberseminar

https://zoom.us/j/93172910947
Meeting ID: 931 7291 0947
For password please contact Christian Kaiser (kaiser@mpim-bonn.mpg.de).

Landau and Ramanujan approximations for divisor sums and coefficients of cusp forms

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Speaker: 
Emil-Alexandru Ciolan
Affiliation: 
MPIM
Date: 
Wed, 2021-08-11 14:30 - 15:30
Parent event: 
Number theory lunch seminar

Zoom ID: 919 6497 4060. For password please contact Pieter Moree (moree@mpim...).

 

Symmetries of 4-manifolds

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Speaker: 
Mark Powell
Affiliation: 
University of Durham/MPIM
Date: 
Thu, 2021-08-05 15:00 - 16:00
Parent event: 
MPI-Oberseminar

https://zoom.us/j/93172910947
Meeting ID: 931 7291 0947
For passcode of this talk please contact Pieter Moree (moree@mpim-bonn.mpg.de)

 

About quasi-modular forms, differential operators and Rankin-Cohen algebras

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Speaker: 
Younes Nikdelan
Affiliation: 
MPIM
Date: 
Wed, 2021-08-04 14:30 - 15:30
Parent event: 
Number theory lunch seminar

In this talk we treat two problems which are parts of an ongoing work. The first one is
a generalization of the canonical Rankin-Cohen structure to the graded algebras which
contain elements of negative degree, namely a generalization of Proposition 1 of
"D. Zagier, Modular forms and differential operators. Proceedings Mathematical Sciences,
104(1):57{75, 1994". The second problem is to give some sufficient conditions under which
a certain combination of a weight 2 quasi-modular form with itself or with an arbitrary modular

New bounds on growth in SL_n

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Speaker: 
Harald Helfgott (University of Göttingen)
Organiser(s): 
Rudradip Biswas (University of Manchester/MPIM)
Date: 
Thu, 2021-07-29 16:00 - 17:00
Parent event: 
Extra talk

Zoom ID: 992 4902 2878
https://zoom.us/j/99249022878

Elliptic curves and chromatic homotopy theory

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Speaker: 
Irina Bobkova
Affiliation: 
Texas A&M University/z.Z. MPIM
Date: 
Thu, 2021-07-29 15:00 - 16:00
Parent event: 
MPI-Oberseminar

https://zoom.us/j/93172910947
Meeting ID: 931 7291 0947
For passcode of this talk please contact Tobias Barthel (tbarthel@mpim-bonn.mpg.de)

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