Guest lectures and seminars - Page 129
Jørgen Vold Rennemo (Oxford) gives the Seminar in Algebra and Algebraic Geometry:
K3 surfaces seminar: The moduli spaces of polarized K3 surfaces
Abstract: There are many interesting examples of groups acting on trees, arising in various fields (e.g. combinatorial group theory, number theory, geometry). When a group acts on a tree, it necessarily also acts on the boundary of the tree, a (totally disconnected) compact Hausdorff space. The C*-algebras obtained from the crossed product construction include many fundamental examples. I will describe methods for analyzing such crossed products, developed in joint work with Nathan Brownlowe, Alex Mundey, David Pask and Anne Thomas.
Manuela Zucknick (Dept. of Biostatistics, UiO) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.
Arvid Siqveland (HBV), gives the Seminar in Algebra and Algebraic Geometry:
K3 surfaces seminar: Endomorphism fields and Mumford–Tate groups II
Abstract: In this follow-up talk, I shall outline how the boundary quotient diagram may be useful for K-theoretic considerations. We start with the diagram within the context of integral dynamics, and then speculate about potentially promising directions of generalizations.