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Conférences

le (55m59s)

V. Tosatti - $C^{1,1}$ estimates for complex Monge-Ampère equations

I will discuss a method that we recently introduced in collaboration with Chu and Weinkove which gives interior C1,1 estimates for the non-degenerate complex Monge-Ampère equation on compact Kähler manifolds (possibly with boundary). The method is sufficiently robust to also give C1,1 regularity of geodesic segments in the space of Kähler metrics (thus resolving a long-standing problem originating from the work of Chen), of quasi-psh envelopes in Kähler as well as nef and big classes (solving a conjecture of Berman), and of geodesic rays that arise from test configurations (improving results of Phong and Sturm), and it even applies to ...
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Conférences

le (53m22s)

C. Voisin - Cubic fourfolds, hyper-Kähler manifolds and their degenerations

There at least three families of hyper-K ̈ahler manifolds built from cubic fourfolds, the most recently discovered one being the compactified intermediate Jacobian fibrations I constructed with Laza and Sacca. In a joint work with Koll ́ar, Laza and Sacca, we provide an easy way to compute their deformation types, by proving that if the central fiber of a degeneration of hyper-Kähler manifolds has one component which is not uniruled, then after base-change the family becomes fiberwise birational to a family of smooth hyper-Kähler manifolds.
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Cours magistraux

le (1h33m32s)

Yuan-Pin Lee - Introduction to Gromov-Witten theory and the crepant transformation conjecture (Part 1)

In these lectures, Gromov-Witten theory will be introduced, assuming only basic moduli theory covered in the rst week of the School. Then the Crepant Transformation Conjecture will be explained. Some examples, with emphasis on the projective/global cases, will be given. Note: The construction of virtual fundamental class, which forms the foundation of the GW theory, will be given in Jun Li's concurrent lectures and will not be explained here.
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Cours magistraux

le (1h32m55s)

Yuan-Pin Lee - Introduction to Gromov-Witten theory and the crepant transformation conjecture (Part 3)

In these lectures, Gromov-Witten theory will be introduced, assuming only basic moduli theory covered in the rst week of the School. Then the Crepant Transformation Conjecture will be explained. Some examples, with emphasis on the projective/global cases, will be given. Note: The construction of virtual fundamental class, which forms the foundation of the GW theory, will be given in Jun Li's concurrent lectures and will not be explained here.
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