Kommende Vorträge

Ausführliche Liste aller demnächst stattfindenden Vorträge und Seminare. Für eine Übersicht konsultieren Sie bitte auch den Kalender [2].

Recent developments in Quantum Topology -- Cancelled -- [3]

Posted in

Vortrag [4]

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.

Quantum group symmetry in CFT [5]

Posted in

Vortrag [4]

Speaker:

Eveliina Peltola

Zugehörigkeit:

HCM

Datum:

Die, 2020-02-25 14:00 - 15:00

Location:

MPIM Lecture Hall [6]

Parent event:

Seminar on Algebra, Geometry and Physics [7]

I discuss applications of a hidden $U_q({sl}_2)$ symmetry in CFT with central charge $c \leq 1$ (focusing on the generic, semisimple case, withcirrational). This symmetry provides a systematic method for solving Belavin-Polyakov-Zamolodchikov PDE systems, and in partic-ular for explicit calculation of the asymptotics and monodromy properties of the solutions.Using a quantum Schur-Weyl duality, one can understand solution spaces of such PDE systems in a detailed way.

Weiterlesen [5]

On the representation of binary quadratic forms by quadratic forms [8]

Posted in

Vortrag [4]

Speaker:

Fabian Waibel

Zugehörigkeit:

Universität Bonn

Datum:

Mit, 2020-02-26 14:30 - 15:30

Location:

MPIM Lecture Hall [6]

Parent event:

Number theory lunch seminar [9]

Let $Q$ and $T$ denote two matrices that represent positive integral quadratic forms. We are investigating the solubility of $X^T Q X = T$ for an integer matrix $X$. Therefore, we consider the Siegel theta series of degree two and derive an asymptotic formula for its Fourier coefficients in the level aspect. This involves computing inner-products of the cuspidal part of theta series and evaluating Fourier coefficients of Eisenstein-Klingen series.

Braids [10]

Posted in

Vortrag [4]

Speaker:

Carlo Pagano

Zugehörigkeit:

University of Leiden

Datum:

Don, 2020-02-27 10:15 - 11:45

Location:

MPIM Seminar Room [11]

Parent event:

Reading group on geometric group theory [12]

Complex-valued harmonic morphisms from Lie groups and symmetric Spaces [13]

Posted in

Vortrag [4]

Speaker:

Sigmundur Gudmundsson

Zugehörigkeit:

Lund University

Datum:

Don, 2020-02-27 13:00 - 14:00

Location:

MPIM Lecture Hall [6]

Parent event:

Oberseminar Differentialgeometrie [14]

The study of harmonic morphisms in the 3-dimensional Euclidean space goes back to a paper of Jacobi from 1848. This was then introduced into the setting of Riemannian geometry, in the late 1970s by Fuglede and Ishihara, independently. A harmonic morphism between two Riemannian manifolds (M, g) and (N, h) is a map that pulls back real-valued harmonic functions on (N,h) to harmonic functions on (M,g).

Weiterlesen [13]

New guests at the MPIM [15]

Posted in

Vortrag [4]

Speaker:

Sergey Ivanov, Giovanni Russo

Datum:

Don, 2020-02-27 15:00 - 16:00

Location:

MPIM Lecture Hall [6]

Parent event:

MPI-Oberseminar [16]

tba [17]

Posted in

Vortrag [4]

Speaker:

Vita Kala

Zugehörigkeit:

Charles University, Prague

Datum:

Mon, 2020-03-02 14:00 - 14:50

Location:

MPIM Lecture Hall [6]

Parent event:

Number theory lunch seminar [9]

Free subgroups of Kleinian groups [18]

Posted in

Vortrag [4]

Speaker:

Misha Belolipetsky

Zugehörigkeit:

(IMPA Rio de Janeiro/MPIM Bonn)

Datum:

Die, 2020-03-03 10:15 - 12:00

Location:

MPIM Lecture Hall [6]

Parent event:

Seminar "Arithmetic of Algebraic Groups" [19]

We show that any cocompact Kleinian group $\Gamma$ has an exhaustive filtration by normal subgroups $\Gamma_i$ such that any subgroup of $\Gamma_i$ generated by $k_i$ elements is free, where $k_i \ge [\Gamma:\Gamma_i]^C$ and $C = C(\Gamma) > 0$. Together with this result we prove that $\log k_i \ge C_1 \mathrm{sys}_1(M_i)$, where $\mathrm{sys}_1(M_i)$ denotes the systole of $M_i$, thus providing a large set of new examples for a conjecture of Gromov. In the second theorem $C_1> 0$ is an absolute constant.

Weiterlesen [18]

Absolute algebraic geometry using gamma sets, after A.Connes and C.Consani [20]

Posted in

Vortrag [4]

Speaker:

Zhiyou Wu

Zugehörigkeit:

MPIM

Datum:

Die, 2020-03-03 14:00 - 15:00

Location:

MPIM Lecture Hall [6]

Parent event:

Seminar on Algebra, Geometry and Physics [7]

This is an expository talk on Connes-Consani's theory of geometry over field with one element. It is based on Segal's theory of gamma sets (see arXiv:1502.05585 [math.AG]). I will explain the background, the basic constructions and some interesting examples.

Foliated Open Books -- or, How I Learned to Stop Worrying About How to Glue Open Books, I [21]

Posted in

Vortrag [4]

Speaker:

Joan Licata

Zugehörigkeit:

Australian National University/MPIM

Datum:

Mon, 2020-03-09 15:00 - 16:00

Location:

MPIM Lecture Hall [6]

Parent event:

MPIM Topology Seminar [22]

In this talk, I'll discuss recent joint work with Vera Vertesi to develop a new version of an open book decomposition for contact three-manifolds. Our foliated open books join a zoo of existing types of open books, so I'll focus on the senses in which ours is a natural construction which provides a user-friendly approach to cutting and gluing.