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| 03/12/2020 | 14h00 (à distance) à distance | Philip Engel,
L'exposé sera diffusé (396 751 8661, demander le mot de passe à Oliver B. ou D. ou Frederic H.).
Compactification of K3 moduli |
| | Abstract: By the Torelli theorem, the moduli space of lattice polarized K3 surfaces is the quotient of a Hermitian symmetric domain by an arithmetic group. In this capacity, it has compactifications such as the Baily-Borel and toroidal compactifications which depend on some choice of fan. On the other hand, choosing canonically an ample divisor on every such K3, one can build a compactification via so-called (KSBA) stable pairs. I will discuss joint work with V. Alexeev on how one proves that the normalization of a stable pair compactification of K3 moduli is the toroidal compactification for an appropriate choice of fan. We will focus on the example of elliptic K3s, polarized by the section plus the sum of the singular fibers. |
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| 10/12/2020 | 14h00 (à distance) à distance | Enrico Arbarello, Rome
L'exposé sera diffusé (ZOOM 396 751 8661, demander le mot de passe à Oliver B. ou D. ou Frederic H.). L'orateur sera à distance. An algebro-geometrical approach to the characterization of Jacobians via the KP equation and via trisecants to the Kummer variety. |
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| 17/12/2020 | 14h00 (à distance) à distance | Eduard Looijenga, Utrecht
L'exposé sera diffusé (396 751 8661, demander le mot de passe à Oliver B. ou D. ou Frederic H.). L'orateur sera à distance.(à préciser) |