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PRODID:researchseminars.org
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BEGIN:VEVENT
SUMMARY:Harrison Bray (University of Michigan)
DTSTART:20200410T180000Z
DTEND:20200410T190000Z
DTSTAMP:20260404T094833Z
UID:ColumbiaGT/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Colum
 biaGT/1/">Random walks on punctured convex real projective surfaces</a>\nb
 y Harrison Bray (University of Michigan) as part of Columbia geometric top
 ology seminar\n\n\nAbstract\nI'll discuss the following result\, joint wit
 h Giulio Tiozzo: Letting $\\Gamma$ be the representation of a punctured hy
 perbolic surface group in $PSL(3\,R)$ acting discretely\, properly discont
 inuously\, and with finite co-volume on a properly convex set in the proje
 ctive plane\, we have that hitting measure for a random walk on any $\\Gam
 ma$-orbit with certain moment conditions is singular with respect to the c
 lassical Patterson-Sullivan measure. The approach extends and adapts the s
 trategy of Maher-Tiozzo for punctured hyperbolic surfaces. We also prove a
 n essential global shadow lemma for finite volume convex real projective m
 anifolds.\n
LOCATION:https://stable.researchseminars.org/talk/ColumbiaGT/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rylee Lyman (Tufts)
DTSTART:20200424T180000Z
DTEND:20200424T190000Z
DTSTAMP:20260404T094833Z
UID:ColumbiaGT/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Colum
 biaGT/2/">Some new CAT(0) free-by-cyclic groups</a>\nby Rylee Lyman (Tufts
 ) as part of Columbia geometric topology seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/ColumbiaGT/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lei Chen (California Institute of Technology)
DTSTART:20200501T180000Z
DTEND:20200501T190000Z
DTSTAMP:20260404T094833Z
UID:ColumbiaGT/3
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Colum
 biaGT/3/">Actions of homeo and diffeo groups on manifolds</a>\nby Lei Chen
  (California Institute of Technology) as part of Columbia geometric topolo
 gy seminar\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 
 manifold N. The main result is an orbit classification theorem\, which ful
 ly classifies possible orbits. I will also talk about some low dimensional
  applications and open questions. This is a joint work with Kathryn Mann.\
 n
LOCATION:https://stable.researchseminars.org/talk/ColumbiaGT/3/
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