Dear all,

I would like to announce the following Mathematics and String theory seminar at Kavli IPMU

Speaker:	 Tony Yue YU	(Institut de Mathématiques de Jussieu - Paris Rive Gauche)
Date:	Tue, Mar 01, 2016, 13:15 - 14:45
Place:	Seminar Room A

Title:	 Counting open curves via closed curves

Abstract: Motivated by mirror symmetry, we will study the counting of open curves in log Calabi-Yau surfaces. Although we start with a complex surface, the counting is achieved by applying methods from Berkovich geometry. The idea is to relate the counting of open curves to special types of closed curves. This gives rise to new geometric invariants inaccessible by classical methods. If time permits, I will present an explicit calculation of these invariants for a cubique surface. The results verify the Kontsevich-Soibelman wall-crossing formula for a focus-focus singularity.

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Todor Eliseev Milanov
Associate Professor 
Kavli IPMU,  Japan

todor.milanov at ipmu.jp