Institut für Mathematik


Modul:   MAT770  Oberseminar: Algebraische Geometrie

Hermitian K-theory and algebraic cobordism of rings of integers and the slice spectral sequence

Vortrag von Dr. Jonas Kylling

Sprecher eingeladen von: Dr. Lorenzo Mantovani

Datum: 03.06.19   Zeit: 13.15 - 14.45   Raum: Y27H25

A powerful computational tool in topology is the Postnikov filtration, which gives rise to the Atiyah-Hirzebruch spectral sequence computing homotopy groups in terms of cohomology groups. In motivic homotopy theory there is a variant of this filtration known as the slice filtration, which gives a spectral sequence computing motivic homotopy groups in terms of motivic cohomology groups. We will carry out a computation of hermitian K-theory and algebraic cobordism of rings of integers using the slice filtration. As corollaries we get a variant of Milnor's conjecture on quadratic forms for rings of integers, and an analogy to the Lichtenbaum conjectures relating special values of zeta-functions to algebraic K-theory. This is based on joint work with Oliver Röndigs and Paul Arne Østvær.