Quotients of higher dimensional Cremona groups

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• Jérémy Blanc (Basel)
• Wednesday 15 May 2019, 14:15-15:15
• CMS MR13.

If you have a question about this talk, please contact Caucher Birkar.

We study large groups of birational transformations $\mathrm{Bir}(X)$, where $X$ is a variety of dimension at least $3$, defined over $\mathbb{C}$ or a subfield of $\mathbb{C}$. Two prominent cases are when $X$ is the projective space $\mathbb{P}^{n$, in which case $\Bir(X)$ is the Cremona group of rank_{$n$, or when $X \subset \mathbb{P}}}{n+1}$ is a smooth cubic hypersurface. In both cases, and more generally when $X$ is birational to a conic bundle, we produce infinitely many distinct group homomorphisms from $\mathrm{Bir}(X)$ to $\mathbb{Z}/2$. As a consequence we also obtain that the Cremona group of rank$n \ge 3$ is not generated by linear and Jonquières elements. Joint work with Stéphane Lamy and Susanna Zimmermann

This talk is part of the Algebraic Geometry Seminar series.

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