Department of Mathematics

Weekly Seminars
Previous month Previous day Next day Next month
See by year See by month See by week See Today Search Jump to month
Colloquium - Richard Gonzales - Equivariant Operational Theories and the Localization Principle
Wednesday, 11. March 2020, 13:30 - 14:30

Richard Gonzales's Talk: Equivariant Operational Theories and the Localization Principle


Abstract: For a complete nonsingular variety with a torus action, the localization principle asserts that one can read-off the equivariant K-theory and Chow cohomology of the variety from that of fixed point subscheme, modulo certain relations given by the fixed loci of codimension-one subtori. For singular varieties, however, such method quite often does not apply. Our goal is to show that in the setting of equivariant operational theories there is a version of the localization principle that works perfectly well for both singular and nonsingular varieties. For instance, if X is any complete variety where a torus acts with finitely many fixed points and invariant curves, then the equivariant operational K-theory of X is a ring of piecewise exponential functions (a version of GKM theory). Some relations to Chow cohomology, via the Riemann-Roch theorem, will be discussed too. 



Date: Wednesday, March 11, 2020

Time: 13:30

Room: TB 130