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Seminar

HDMP - Weekly Seminar: Spectral networks and invariants of saddle counting for quadratic and higher differentials October 16, 2019 (12:50 PM PDT - 01:50 PM PDT)
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Location: MSRI: Simons Auditorium
Speaker(s) Pietro Longhi (ETH Zurich)
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Counts of special trajectories of quadratic differentials on Riemann surfaces are an example of Donaldson-Thomas invariants, they exhibit wall-crossing phenomena over the moduli space of differentials. I will describe a combinatorial construction of the Kontsevich-Soibelman invariant for this counting problem based on ribbon graphs of degenerate Jenkins-Strebel differentials. Time permitting, I will also sketch generalizations to motivic wall-crossing invariants, and to collections of k-differentials in the context of Hitchin systems.

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