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Iskovskikh Seminar
February 26, 2015 18:00, Moscow, Steklov Mathematical Institute, room 540

Singularities of a threefold having an effective ample divisor which is a smooth surface of Kodaira dimension zero

E. Gorinov

Lomonosov Moscow State University, Faculty of Mechanics and Mathematics

Abstract: Our talk is based on a paper of Ivan Cheltsov (http://www.mathnet.ru/php/archive.phtml?wshow=paper&jrnid=mzm&paperid=1755&option_lang=eng). We prove that a threefold $X$ having an effective ample divisor which is a smooth surface of Kodaira dimension zero is either a contraction of exceptional section $\mathbb{P}(\mathcal{O}_H + \mathcal{O}_H(H))$ or $X$ has only canonical singularities and $H$ is K3 or Enriques surface.