Dear Wardens of Hamiltonian Systems,

Note: For this coming week 12PM EDT in Toronto corresponds to 5pm in Europe, 4pm in the UK, 9am in California). This will change back to a 6 hour difference with Europe after that week.

The next talk at our seminar by Eckhard Meinrenken (Univ of Toronto) "Symplectic geometry of projective structures on surfaces with boundary" will be this coming Thursday, October 30, 2025 at 12PM EDT.

Abstract: Let $\Sigma$ be a compact, oriented surface with boundary. In work with Anton Alekseev, we found that the Teichmueller space of hyperbolic 0-metrics on $\Sigma$, up to isotopies fixing the boundary, is naturally a Hamiltonian Virasoro space. In more recent work with Ahmadreza Khazaeipoul, we give a similar construction for the deformation space of $RP(2)$-structures with nondegenerate boundary, and show that it is a Hamiltonian space for the groupoid integrating the Gelfand-Dikii Poisson structure.

We'll keep the Zoom coordinates the same:
Zoom at   99576627828
Passcode: 448487
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FROM 202.120.11.*