Joint Number Theory Seminars at Beijing

Friday, July 4, 2008

2008-07-07 Noriko Yui: On the modularity of certain K3 fibered Calabi-Yau threefolds


报告人:Prof.Noriko Yui
Queen’s University

报告内容:On the modularity of certain K3 fibered Calabi-Yau threefolds

4:30-5:30 pm


We will discuss the modularity of Galois representations associated to Calabi–
Yau threefolds over Q. We will focus on Calabi–Yau threefolds over Q which are
non-rigid, that is, those Calabi–Yau threefolds with the third Betti number B
> 2.
When a Calabi–Yau threefold is non-rigid, the dimension B
of the Galois repre-
sentation gets rather large, and the modularity question poses a serious challenge.
We will construct explicit examples of non-rigid Calabi–Yau threefolds fibered
over P
by non-constant semi-stable K3 surfaces and reaching the Arakelov–Yau
upper bound. For these examples, we prove that the “interesting” part of their
L-series do come from modular forms.
Further, we will consider more general K3-fibered Calabi–Yau threefolds over Q
than the above examples. For these Calabi–Yau threefolds, we decompose Calabi–
Yau threefolds into motives. Then we address the modularity question for some of
the motives. We will compute the motivic zeta-functions and L-series, and establish
the modularity in a number of examples.
We also discuss arithmetic mirror symmetry for these Calabi-Yau threefolds.
This is a joint work in progress with Y. Goto and R. Kloosterman.


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