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SUMMARY:Federico Scavia (UBC)
DTSTART:20210628T191500Z
DTEND:20210628T200500Z
DTSTAMP:20260413T060649Z
UID:zoomnovy/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/zoomnovy/4/"
 >The behavior of essential dimension under deformations</a>\nby Federico S
 cavia (UBC) as part of Algebraic groups and algebraic geometry: in honor o
 f Zinovy Reichstein's 60th birthday\n\n\nAbstract\nLet k be a field of cha
 racteristic zero\, G be a linear algebraic k-group\, and n a non-negative 
 integer. We show that in a flat family of primitive generically free G-var
 ieties over a base k-variety B\, the points of B whose geometric fiber has
  essential dimension at most n form a countable union of closed subsets of
  B. As an application\, we construct unramified non-versal G-torsors of ma
 ximal essential dimension. This is joint work with Zinovy Reichstein.\n
LOCATION:https://researchseminars.org/talk/zoomnovy/4/
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