Department of

# Mathematics

Seminar Calendar
for events the day of Wednesday, December 18, 2019.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Wednesday, December 18, 2019

11:15 am in 245 Altgeld Hall,Wednesday, December 18, 2019

#### Hodge theory and o-minimality

###### Benjamin Bakker   [email] (University of Georgia)

Abstract: The cohomology groups of complex algebraic varieties come equipped with a powerful but intrinsically analytic invariant called a Hodge structure. The fact that Hodge structures of certain very special algebraic varieties are nonetheless parametrized by algebraic varieties has led to many important applications in algebraic and arithmetic geometry, but this fails badly in general. Recent joint work with Y. Brunebarbe, B. Klingler, and J. Tsimerman remedies this by showing that parameter spaces of Hodge structures always admit "tame" analytic structures in a sense made precise using ideas from model theory. A salient feature of the tame analytic category is that it allows for the local flexibility of the full analytic category while preserving the global behavior of the algebraic category. In this talk I will explain this perspective as well as some important applications, including an easy proof of a celebrated theorem of Cattani--Deligne--Kaplan on the algebraicity of Hodge loci and the resolution of a longstanding conjecture of Griffiths on the quasiprojectivity of the images of period maps.