Archived Events

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Transformations between classical geometric structures [2]

Posted in

Talk [3]

Speaker:

Vladlen Timorin

Affiliation:

HSE Moscow/MPI

Date:

Wed, 2010-02-17 14:00 - 15:00

How to find all diffeomorphisms between an open subset of a real projective space and an open subset of a sphere that take all straight line segments to arcs of circles? We will discuss this and similar questions - these questions look classical but they are open in higher dimensions. In dimension 4, these questions have unexpected answers.

Moduli of abelian varieties and congruences of Siegel mod. forms [4]

Posted in

Talk [3]

Speaker:

Jonas Bergström

Affiliation:

U of Amsterdam/MPI

Date:

Wed, 2010-02-17 11:15 - 12:15

Location:

MPIM Lecture Hall [5]

Congruences between modular forms and mixed motives [6]

Posted in

Talk [3]

Speaker:

G. Harder

Affiliation:

MPIM

Date:

Wed, 2010-02-17 10:00 - 11:00

Location:

MPIM Lecture Hall [5]

F-manifolds III: Mirrors of projective spaces [7]

Posted in

Talk [3]

Speaker:

Yuri Manin

Affiliation:

MPIM

Date:

Tue, 2010-02-16 14:00 - 15:00

Location:

MPIM Lecture Hall [5]

I will explain in a rather detailed and explicit way, how quantum cohomology of spaces $P^r$ is related to their Landau-Ginzburg models, in terms of isomorphisms of their respective F-manifolds. I will then discuss the wider context of Przyjalkowski talk focusing on exercises and/or research problems.

Moduli of abelian varieties and congruences of Siegel mod. forms [8]

Posted in

Talk [3]

Speaker:

Jonas Bergström

Affiliation:

U of Amsterdam/MPI

Date:

Fri, 2010-02-12 15:25 - 16:30

Location:

MPIM Lecture Hall [5]

The Nielsen-Thurston classification: proof [9]

Posted in

Talk [3]

Speaker:

N. Ivankov

Date:

Wed, 2010-02-10 16:30 - 17:30

Location:

MPIM Lecture Hall [5]

Smooth curves having a large automorphism p-group in characteristic p>0 [10]

Posted in

Talk [3]

Speaker:

Magali Rocher

Affiliation:

U de Bordeaux I / MPI

Date:

Wed, 2010-02-10 14:15 - 15:15

Location:

MPIM Lecture Hall [5]

Parent event:

Number theory lunch seminar [11]

Let k be an algebraically closed field of characteristic p>0 and C a connected nonsingular projective curve over k with genus g>1. Let G be a p-subgroup of the k-automorphism group of C such that |G| > 2pg/(p-1). Then, C -->C/G is an étale cover of the affine line Spec k[X] totally ramified at infinity. To study such actions, we focus on the second ramification group G_2 of G at infinity, knowing that G_2 actually coincides with the derived group of G. We first display realizations of such actions with G_2 abelian of arbitrary large exponent .

Read more [10]

Weak Landau--Ginzburg models for Fano varieties [12]

Posted in

Talk [3]

Speaker:

V. Przyjalkowski

Affiliation:

Steklov/U Vienna

Date:

Tue, 2010-02-09 14:00 - 15:00

Location:

MPIM Lecture Hall [5]

Mirror Symmetry studies the correspondence between varieties or one-dimensional families of varieties. Under this correspondence algebraic data of variety reflects symplectic data of its dual symplectic data reflects algebraic data of the dual. The dual to a Fano variety is a Landau--Ginzburg model --- a one-dimensional family of varieties. There is no general method to find a Landau--Ginzburg model for given Fano variety. We observe most of known approaches for finding them in particular cases.

Read more [12]

Natural operations on the Hochschild cohomology [13]

Posted in

Talk [3]

Speaker:

Martin Markl

Affiliation:

Czech Academy,Prague / MPI

Date:

Mon, 2010-02-08 15:00 - 16:00

Location:

MPIM Lecture Hall [5]

The talk will be devoted to the problem of classification of all natural operations acting on the Hochschild cohomology of an associative algebra, by which one usually means the understanding of the homotopy type of the operad B formed by these operations. We will explain what a "natural operation" is and present two equivalent definitions of completely different natures. We then describe the homotopy type of B and show how is this descrition related to the Deligne Hochschild cohomology conjecture.

Small quantum D-modules [14]

Posted in

Talk [3]

Speaker:

V. Golyshev

Date:

Fri, 2010-02-05 14:00 - 15:00

Location:

MPIM Lecture Hall [5]