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Seminar

EGN Postdoc and student seminar: Using the topological vertex outside toric geometry April 03, 2018 (10:30 AM PDT - 12:00 PM PDT)
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Location: MSRI: Simons Auditorium
Speaker(s) Martijn Kool (Universiteit Utrecht)
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The topological vertex, introduced by Aganagic-Klemm-Marino-Vafa, is a combinatorial gadget for calculating Donaldson-Thomas invariants of toric Calabi-Yau threefolds. Yet, in Jim's banana talk last week, we saw him use it for a *non-toric* Calabi-Yau threefold. In this talk I explain in some more detail how and why the topological vertex can indeed be used in some non-toric settings. I illustrate this in the (simpler) case of local elliptic surfaces, which leads to a new way of finding the Katz-Klemm-Vafa formula.

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