Dear colleagues:

We announce the following seminar at IPMU
(the Institute for the Physics and Mathematics of the Universe).
We now have the title and abstract for Dr. Galkin's talk.

Regards,

Satoshi Kondo (IPMU)

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Speaker:        Sergei Galkin (IPMU)
Title: Apery and Gamma
Abstract: For a Fano variety X we introduce the Apery class -
characteristic cohomology class derived from quantum D-module of X.
Experimentally it's coefficients with respect to an integer Betti
basis are shown to be polynomials evaluated in the values of Riemann's
zeta-function of positive integer arguments.
This structure resembles the Gamma-class of Fano varieties,
that conjecturally provides the integral structure of quantum
cohomology coming from the integral Betti structure in the fiber of
the mirror partner. We find a relation between Apery class and Gamma
class, and give a physical (i.e. modulo Mirror Symmetries conjectures)
explanation why this relation holds.
Date:   June 4, 2009, 10:30 - 12:00
Place:  Seminar Room at IPMU Prefab. B
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Speaker:         Joseph Maher (visiting Tokyo Institute of Technology)
Title:  Generic elements of the mapping class group.
Date:   Jun 04, 2009, 15:30 - 17:00
Place:  Seminar Room at IPMU Prefab. B
Abstract:       The mapping class group of a surface is the group of all
maps from a surface to itself, and occurs naturally in a variety of
areas of mathematics. We discuss what it might mean for a group
element to be generic, and show that the irreducible elements of the
mapping class group are generic for certain definitions of generic.
This uses recent results on the large scale geometry of the mapping
class group, and has applications to 3-manifolds.
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You can check the location from
http://www.ipmu.jp/access/img/KashiwaCampusMap.png

The schedule of the seminar can be checked from
http://db.ipmu.jp/seminar/?mode=seminar_recent