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SUMMARY:Barbara Schapira (Université de Rennes I)
DTSTART:20210309T140000Z
DTEND:20210309T150000Z
DTSTAMP:20260423T021018Z
UID:Geometry/21
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Geometry/21/
 ">Amenability of covers through critical exponents</a>\nby Barbara Schapir
 a (Université de Rennes I) as part of Pangolin seminar\n\n\nAbstract\nLet
  M be a negatively curved manifold. If M is “strongly positively recurre
 nt”\, i.e. there is a critical gap between its entropy at infinity and i
 ts entropy\, we show that a cover M' of M is amenable if and only if the c
 ritical exponents of M' and M coincide. The proof uses a construction of P
 atterson-Sullivan measures twisted by a representation. This is a joint wo
 rk with R. Dougall\, R. Coulon and S.Tapie.\n
LOCATION:https://researchseminars.org/talk/Geometry/21/
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