## Geometry and Physics Seminar: Zinovy Reichstein

- Date: 11/10/2014
- Time: 15:00

*UBC*

University of British Columbia

Versal actions with a twist

The term “versal” is best understood by subtracting “unique” from both sides of the formulaUniversal = unique + versal.In this talk based on joint work with Alex Duncan, I will discuss competing notions of versality for the action of an algebraic group G on an algebraic variety X and relate these notions to properties (such as existence and density) of rational points on twisted forms of X. I will then present examples, where this relationship can be used to prove that certain group actons are versal or, conversely, that certain varieties have rational points.

This is a live e-seminar hosted by The University of British Columbia in ESB 4127 and broadcast at The University of Alberta in CAB 449 at 4:00 pm (MST).