# Events

Conferences, seminars, talks and other events at the MPI for Mathematics

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## Geometric Representation Theory

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Date:
Mon, 2020-06-22 (All day) - Fri, 2020-06-26 (All day)

## Workshop on "$\infty$-categories and their applications", August 17 - 21, 2020

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Organiser(s):
Hongyi Chu & Bruno Stonek
Date:
Mon, 2020-08-17 09:00 - Fri, 2020-08-21 17:00
Location:
MPIM Lecture Hall

## Upcoming Talks

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Abstracts of upcoming talks at the MPIM. For an overview see also the calendar.

## Recent developments in Quantum Topology -- Cancelled --

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We will review the basics of quantum topology such as the colored Jones polynomial of a knot, its standard conjectures relating to asymptotics, arithmeticity and modularity, as well as the recent quantum hyperbolic invariants of Kashaev et al, their state-integrals and their structural properties. The course is aimed to be accessible by graduate students and young researchers.

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## Riemann-Hilbert problems from refined DT

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Speaker:
Anna Barbieri
Affiliation:
Sheffield
Date:
Fri, 2020-06-05 18:00 - 19:30

This talk is about an instance of a Riemann-Hilbert (RH) problem from refined  Donaldson-Thomas theory. First we will review the solution to the RH problem attached to an uncoupled BPS structure, then we will discuss the statement and a solution to an associated quantized RH problem, corresponding to refined DT theory. The foundation of the topic was presented in the previous talk by Gaetan.

## VIRTUAL (Zoom): Equivariant Khovanov homotopy type

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Speaker:
Wojciech Politarczyk
Affiliation:
Warsaw University
Date:
Mon, 2020-06-08 15:00 - 16:00
Parent event:
MPIM Topology Seminar

The Khovanov homotopy type is a space level refinement of Khovanov homology in troduced by Lipshitz and Sarkar. The main
goal of the talk will be to show that the Khovanov homotopy type can be effectively used to study periodic links, i.e., links which are invariant under a finite order rotation of the three-sphere. In particular, by applying the classical localization theorem for Borel cohomology and its extension we obtain interesting relations between Khovanov homology of a periodic link and Khovanov homology of the quotient.

## ONLINE: Semisimple topological quantum field theories and exotic smooth structure

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Speaker:
David Reutte
Affiliation:
MPIM
Date:
Tue, 2020-06-09 14:00 - 15:00

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

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE: The topological period-index problem

Posted in
Speaker:
Xing Gu
Affiliation:
MPIM
Date:
Tue, 2020-06-16 14:00 - 15:00

The topological period-index problem (TPIP), an analogue to the long-standing period-index conjecture in algebraic geometry, concerns a given torsion class α in the 3rd integral cohomology group of a topological space X and various principal PU_n-bundles over X associated to α. Here PU_n is the projective unitary group of order n, i.e., the unitary group U_n modulo invertible scalars. TPIP was first considered by Antieau and Williams in an attempt to find a counterexample to the period-index conjecture, but later turned out to have its own significance.

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## Mathematical events in Bonn

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##### Bonn Mathematics Calendar

All mathematical events in Bonn are listed in the Bonn Mathematics Calendar. For directions see the map.

##### University Calendar

All lectures and courses at Bonn University can be found in the university calendar.

## Recurring seminars, series and courses

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Detailed list of recurring seminars, series of talks, and courses or lectures comprising multiple talks. For an overview see also the calendar.

## 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.

## 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.

## Topics in Topology

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Location:
MPIM Lecture Hall

Posted in

Posted in
Organiser(s):
C. Kaiser

## Representation theory learning seminar

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Organiser(s):
Hankyung Ko, Emily Norton, Thorsten Heidersdorf

## Extra talk

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This is a collection of extra talks that don't fit into the other series.

## Seminar on Weighted Hurwitz numbers and topological recursion

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Organiser(s):
Dan Betea and Danilo Lewanski

## A study group on Milnor invariants

Posted in
Organiser(s):
Danica Kosanovich
Affiliation:
MPIM
Location:
MPIM Seminar Room

## Reading group on "Integer points in polyhedra"

Posted in
Organiser(s):
Gaetan Borot, Alessandro Giacchetto
Location:
MPIM Seminar Room

We will introduce the algebra of (indicator functions) of polyhedra and study its properties. Linear forms on this algebra produce functions on the set of polytopes (i.e. bounded polyhedra), that are compatible with set-theoretic decompositions of polyhedra. For polytopes, the lattice point count or the volume are examples of such linear forms.

## Archived Events

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To narrow the list of events displayed please select year and event type or fill the search fields, then press Apply.

## MPI-Oberseminar

Posted in
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

Posted in
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.

## Workshop on "$\infty$-categories and their applications", August 17 - 21, 2020

Posted in
Organiser(s):
Hongyi Chu & Bruno Stonek
Date:
Mon, 2020-08-17 09:00 - Fri, 2020-08-21 17:00
Location:
MPIM Lecture Hall

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## Geometric Representation Theory

Posted in
Date:
Mon, 2020-06-22 (All day) - Fri, 2020-06-26 (All day)

## ONLINE Reading group: DT invariants, stability conditions and geometry

Posted in
Organiser(s):
Gaetan Borot, Severin Charbonnier, Alessandro Giacchetto, Reinier Kramer and Campbell Wheeler
Affiliation:
MPIM
Date:
Fri, 2020-04-10 10:00 - 11:30
Date:
Fri, 2020-04-17 10:00 - 11:30
Date:
Fri, 2020-04-24 10:00 - 11:30
Date:
Fri, 2020-05-01 10:00 - 11:30
Date:
Fri, 2020-05-08 10:00 - 11:30
Date:
Fri, 2020-05-15 10:00 - 11:30
Date:
Fri, 2020-05-22 10:00 - 11:30
Date:
Fri, 2020-05-29 10:00 - 11:30
Date:
Fri, 2020-06-05 10:00 - 11:30
Date:
Fri, 2020-06-12 10:00 - 11:30
Date:
Fri, 2020-06-19 10:00 - 11:30
Date:
Fri, 2020-06-26 10:00 - 11:30
Date:
Fri, 2020-07-03 10:00 - 11:30
Date:
Fri, 2020-07-10 10:00 - 11:30
Date:
Fri, 2020-07-17 10:00 - 11:30

We will start an online reading group on DT invariants, stability conditions and geometry, to take place on
Fridays 10-11.30am. The first talk is background and will take place on Friday 10 (this week).

## ONLINE: The topological period-index problem

Posted in
Speaker:
Xing Gu
Affiliation:
MPIM
Date:
Tue, 2020-06-16 14:00 - 15:00

The topological period-index problem (TPIP), an analogue to the long-standing period-index conjecture in algebraic geometry, concerns a given torsion class α in the 3rd integral cohomology group of a topological space X and various principal PU_n-bundles over X associated to α. Here PU_n is the projective unitary group of order n, i.e., the unitary group U_n modulo invertible scalars. TPIP was first considered by Antieau and Williams in an attempt to find a counterexample to the period-index conjecture, but later turned out to have its own significance.

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