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Dear all,

Please be informed of the new Zoom Algebraic Geometry (ZAG) Seminar that meets on Tuesdays and Thursday.  Details can be found athttps://www.maths.ed.ac.uk/cheltsov/zag/

I invite those interested to join the mailing list found on that website for future announcements and passwords.

Kind regards,
Julius Ross
Associate Professor
MSCS, UIC

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  5 May 2020 (Tuesday), 15:00 GMT
Chen Jiang (Fudan University, China)
Title: Minimal log discrepancies of 3-dimensional non-canonical singularities
Abstract: Canonical and terminal singularities, introduced by Reid, appear naturally in minimal model program and play important roles in the birational classification of higher dimensional algebraic varieties. Such singularities are well-understood in dimension 3, while the property of non-canonical singularities is still mysterious. We investigate the difference between canonical and non-canonical singularities via minimal log discrepancies (MLD). We show that there is a gap between MLD of 3-dimensional non-canonical singularities and that of 3-dimensional canonical singularities, which is predicted by a conjecture of Shokurov. This result on local singularities has applications to global geometry of Calabi–Yau 3-folds. We show that the set of all non-canonical klt Calabi–Yau 3-folds are bounded modulo flops, and the global indices of all klt Calabi–Yau 3-folds are bounded from above.
Zoom:https://us02web.zoom.us/j/9918493831?pwd=YTRnQ25hK0pQcDcvNHkxekp4Wk50UT09
ID: 991 849 3831
Password: ChenAndSam
Host: Ivan Cheltsov [[log in to unmask]];

7 May 2020 (Tuesday), 18:00 GMT
Samuel Grushevsky (Stony Brook University)
Host: Ivan Cheltsov [[log in to unmask]];
Title:  Geometry of moduli of cubic threefolds
Abstract: The moduli space of cubic threefolds can be thought of as a GIT quotient of the projective space of all cubic polynomials, studied via the period map to a ball quotient, or via the intermediate Jacobians. We describe the relations between various compactifications of the moduli space of cubic threefolds that arise in these ways, and compute their cohomology. Based on joint works with S. Casalaina-Martin, K. Hulek, R. Laza.
Zoom:https://us02web.zoom.us/j/9918493831?pwd=YTRnQ25hK0pQcDcvNHkxekp4Wk50UT09
ID: 991 849 3831
Password: ChenAndSam

Please join Zoom meetings with your first and last name, and mute your microphone.
Please do not share the passwords and zoom links in social media to avoid Zoom bombing.

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