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Guest lectures and seminars - Page 26

Michał and Grzegorz Kapustka - Nikulin type orbifolds

Time and place: Feb. 22, 2023 12:15 PM – 2:00 PM, NHA B1119

We will discuss the recent theory of Nikulin orbifolds and orbifolds of Nikulin type in dimension 4. Nikulin orbifolds are irreducible holomorphic symplectic orbifolds which are partial resolutions of quotients of IHS manifolds of K3^[n] type. Their deformations are called orbifolds of Nikulin type. Our main aim will be the description of the first known locally complete family of projective irreducible holomorphic symplectic orbifolds of dimension 4 which are of Nikulin type. It is a family of IHS orbifolds that appear as double covers of special complete intersections (3,4) in P^6. This is joint work with Ch. Camere and A. Garbagnati.

Lucas Hataishi: Injectivity and crossed products

Time and place: Feb. 22, 2023 10:15 AM – 11:00 AM, NHA107

C*-algebra seminar talk by Lucas Hataishi (University of Oslo)

Time and place: Feb. 16, 2023 2:15 PM – 4:00 PM, NHA B1120

Following Givental, enumerative mirror symmetry can be stated as a relation between genus zero Gromov-Witten invariants and period integrals. I will talk about a relative version of mirror symmetry that relates genus zero relative Gromov-Witten invariants of smooth pairs and relative periods. Then I will talk about how to use it to compute the mirror proper Landau-Ginzburg potentials of smooth log Calabi-Yau pairs.

Yan Xu: The development of a potential flow solver based on finite difference method and immersed boundary technique.

Time and place: Feb. 10, 2023 12:40 PM – 1:00 PM, Niels Henrik Abels hus, 9th floor

I will go through my PhD work at DTU. It is about the development of a fully-nonlinear finite difference based potential flow solver which imposes all of the fluid boundaries via an immersed boundary method. The convergence and stability of this approach is first established for various linear and nonlinear wave propagation problems. When it comes to the wave-body interaction problem, cautious attention is paid to the intersection point between free surface and body surface, and a scheme which meets the accuracy and stability requirements best is picked from several proposals. With the scheme introduced in this paper, piston type wave maker and forced heaving cylinder cases with high oscillation frequency have been simulated successfully.