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

"A world from a sheet of paper". Hirzebruch lecture by Tadashi Tokieda on Wednesday, October 31, University Club Bonn

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Speaker: 
Tadashi Tokieda
Affiliation: 
MPIM
Date: 
Wed, 2018-10-31 19:00 - 20:00
Location: 
University Club Bonn

Starting from just a sheet of paper, by folding, stacking, crumpling, tearing, we will explore a rich variety of phenomena, from magic tricks and geometry to elasticity and the traditional Japanese art of origami. Much of the lecture consists of actual table-top demos, which you can try later with friends and family.

Professor Tadashi Tokieda is a professor of mathematics at Stanford University.  He grew up as a painter in Japan, became a classical philologist in France, and has been an applied mathematician in the US and Europe.  He is active in outreach in the developing world, especially via the African Institute for Mathematical Sciences.

Symmetric matrices associated with oriented link diagrams.

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Speaker: 
Rinat Kashaev
Affiliation: 
University of Geneva
Date: 
Mon, 2018-10-22 13:00 - 14:00
Location: 
MPIM Lecture Hall
Parent event: 
Extra talk

Motivated by metaplectic invariants of Goldschmidt–Jones,
generalizing the cyclotomic invariants of Kobayashi–Murakami–Murakami,
I will explain a construction which associates to each oriented link
diagram a symmetric matrix with elements being quadratic polynomials
in one indeterminate with integer coefficients. Based on a slightly
modified S-equivalence of Trotter and Murasugi in the space of
symmetric matrices, the construction gives rise to an invariant
of oriented links. In particular, the signature of the matrix is
conjecturally related to the Tristram–Levine signature function.

Warps and grids for double and triple vector bundles

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Speaker: 
Magdalini Flari
Affiliation: 
Porto / MPIM
Date: 
Wed, 2018-11-07 10:30 - 12:00
Location: 
MPIM Lecture Hall

What is an Einstein metric?

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Speaker: 
Changliang Wang
Date: 
Fri, 2018-10-26 15:30 - 16:30
Location: 
MPIM Lecture Hall
Parent event: 
"What is...?" seminar

What is a Berkovich space?

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Speaker: 
Tinhinane Amina Azzouz
Date: 
Fri, 2018-10-26 14:00 - 15:00
Location: 
MPIM Lecture Hall
Parent event: 
"What is...?" seminar

What is a Teichmüller polynomial?

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Speaker: 
Ferran Valdez
Date: 
Fri, 2018-10-26 13:00 - 14:00
Location: 
MPIM Lecture Hall
Parent event: 
"What is...?" seminar

"What is...?" seminar

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Organiser(s): 
Charles Fougeron
Date: 
Fri, 2018-10-26 13:00 - 16:30
Location: 
MPIM Lecture Hall

Belyi's theorem/dessin d'enfant

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Speaker: 
Boulos El Hilany
Affiliation: 
MPIM
Date: 
Thu, 2018-10-25 16:30 - 19:00
Location: 
MPIM Seminar Room

Presentation of number theory aspects of Ihara's paper

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Speaker: 
Alexander Betts
Affiliation: 
MPIM
Date: 
Thu, 2018-10-18 16:30 - 19:00
Location: 
MPIM Seminar Room

Dinner at Gasthaus "zum Stiefel"

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Date: 
Thu, 2018-11-22 19:00 - 21:00

We have arranged a dinner for Thursday evening at 7 pm in the Kaminzimmer at "Im Stiefel".

The price will be 40 EUR per person.

Further information will follow.

Propagators of the wave equation on low regularity spacetimes

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Speaker: 
Yafet Erasmo Sanchez Sanchez
Affiliation: 
Leibniz Universität Hannover/MPIM
Date: 
Tue, 2018-10-23 12:00 - 13:00
Location: 
MPIM Lecture Hall

In this talk, I will define the classical and non-classical of the wave equation.
Also, I will give some motivations about why low regularity scenarios are interesting.
Finally, I will focus on the classical ones and its relationship with  Quantum Field Theory in spacetimes with limited regularity.  

 

10-minute talks

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Speaker: 
Alexander Adam, Vincent Delecroix, Karin Melnick, Jose-Ferran Valdez-Lorenzo
Date: 
Thu, 2018-12-13 16:30 - 17:30
Location: 
MPIM Lecture Hall

tba

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Speaker: 
tba
Date: 
Thu, 2018-11-22 10:00 - 12:00
Location: 
MPIM Seminar Room

tba

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Speaker: 
tba
Date: 
Thu, 2018-11-15 10:00 - 12:00
Location: 
MPIM Seminar Room

The twisted dynamical zeta functions of Ruelle and Selberg of locally symmetric spaces of rank 1 and applications

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Speaker: 
Polyxeni Spilioti
Affiliation: 
Universität Tübingen/MPIM
Date: 
Tue, 2018-10-16 12:00 - 13:00
Location: 
MPIM Lecture Hall

The twisted zeta functions of Ruelle and Selberg are dynamical zeta functions, which are represented by Euler-type products over the prime closed geodesics on a compact hyperbolic manifold. For locally symmetric manifolds, harmonic analysis provides a powerful tool, the Selberg trace formula, that one can use to prove the meromorphic continuation of the dynamical zeta functions. These zeta functions have been long studied by Fried, Bunke and Olbrich, Müller, Pfaff,  Fedosova and Pohl under certain assumptions for the representation of the fundamental group. In this talk, we will present some results concerning the dynamical zeta functions, which are twisted by arbitrary representations of the fundamental group and their connections to spectral and L^^2-invariants.

The Chevalley-Eilenberg complex of a dgLa

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Speaker: 
tba
Date: 
Thu, 2018-11-08 10:00 - 12:00
Location: 
MPIM Seminar Room

Deformation functors - a modern approach

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Speaker: 
tba
Date: 
Thu, 2018-10-25 10:00 - 12:00
Location: 
MPIM Seminar Room

We will continue the study of deformation problems by getting to a modern defintion of a deformation functor. These are functors from local differential graded Artinian rings to simplicial sets. The Maurer-Cartan equation provides a such a deformation functor out of a dgLa. The talk includes some discussion on the necessary tools on simplicial sets

Deformation problems

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Speaker: 
Alex Betts
Date: 
Thu, 2018-10-18 10:00 - 12:00
Location: 
MPIM Seminar Room

In this talk we will continue the introduction to deformation problems by taking a different point of view on them:

We will discuss local artinian rings, and how some natural deformation problems can be posed as functors from local artinian rings to sets, or better, to simplicial sets. We will also see what kind of properties such functors satisfy. The talk will include a reminder on the needed definitions and not assume previous knowledge of simplicial sets.

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