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PRODID:researchseminars.org
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BEGIN:VEVENT
SUMMARY:Harrison Bray (University of Michigan)
DTSTART:20200410T180000Z
DTEND:20200410T190000Z
DTSTAMP:20260422T225844Z
UID:ColumbiaGT/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/ColumbiaGT/1
 /">Random walks on punctured convex real projective surfaces</a>\nby Harri
 son Bray (University of Michigan) as part of Columbia geometric topology s
 eminar\n\n\nAbstract\nI'll discuss the following result\, joint with Giuli
 o Tiozzo: Letting $\\Gamma$ be the representation of a punctured hyperboli
 c surface group in $PSL(3\,R)$ acting discretely\, properly discontinuousl
 y\, and with finite co-volume on a properly convex set in the projective p
 lane\, we have that hitting measure for a random walk on any $\\Gamma$-orb
 it with certain moment conditions is singular with respect to the classica
 l Patterson-Sullivan measure. The approach extends and adapts the strategy
  of Maher-Tiozzo for punctured hyperbolic surfaces. We also prove an essen
 tial global shadow lemma for finite volume convex real projective manifold
 s.\n
LOCATION:https://researchseminars.org/talk/ColumbiaGT/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rylee Lyman (Tufts)
DTSTART:20200424T180000Z
DTEND:20200424T190000Z
DTSTAMP:20260422T225844Z
UID:ColumbiaGT/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/ColumbiaGT/2
 /">Some new CAT(0) free-by-cyclic groups</a>\nby Rylee Lyman (Tufts) as pa
 rt of Columbia geometric topology seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/ColumbiaGT/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lei Chen (California Institute of Technology)
DTSTART:20200501T180000Z
DTEND:20200501T190000Z
DTSTAMP:20260422T225844Z
UID:ColumbiaGT/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/ColumbiaGT/3
 /">Actions of homeo and diffeo groups on manifolds</a>\nby Lei Chen (Calif
 ornia Institute of Technology) as part of Columbia geometric topology semi
 nar\n\n\nAbstract\nIn this talk\, I discuss the general question of how to
  obstruct and construct group actions on manifolds. I will focus on large 
 groups like Homeo(M) and Diff(M) about how they can act on another manifol
 d N. The main result is an orbit classification theorem\, which fully clas
 sifies possible orbits. I will also talk about some low dimensional applic
 ations and open questions. This is a joint work with Kathryn Mann.\n
LOCATION:https://researchseminars.org/talk/ColumbiaGT/3/
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