Spring 2026
Our seminar meets Tuesdays at 4:30 in JCC 502. Talks are in person and also streamed on Zoom. You can subscribe to the GGTT mailing list at https://elist.tufts.edu/sympa/info/ggtt for details and announcements. The seminar organizers are Corey Bregman, Hyeran Cho, Kim Ruane and Genevieve Walsh.
| Date | Speaker | Title/Abstract |
|---|---|---|
| Jan 20 | TBD |
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| Jan 27 | Porter Morgan (UMass Amherst) |
Abstract: A simplified broken Lefschetz fibration (SBLF) is a type of map from a smooth, compact 4-manifold to a sphere or disk. Unlike Lefschetz fibrations, which have more restricted singular sets, SBLFs are admitted by all closed, smooth 4-manifolds. One implication of this is that we can study the topology of a 4-manifold by examining the data coming from an SBLF it admits. This data comes in the form of an ordered tuple of curves on a closed surface. In this talk, we will focus on SBLFs admitted by closed nonorientable 4-manifolds. We’ll describe how to construct Kirby diagrams corresponding to these SBLFs, as well as their orientation double covers. Using this information, we will characterize all closed nonorientable 4-manifolds admitting genus two SBLFs. This is joint work with İnanç Baykur. |
| Feb 3 | TBD |
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| Feb 10 | TBD |
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| Feb 17 | TBD |
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| Feb 24 | TBD |
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| Mar 3 | TBD |
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| Mar 10 | TBD |
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| Mar 17 | No Seminar | Spring Break |
| Mar 24 | Shaked Bader (Oxford) |
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| Mar 31 | TBD |
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| Apr 7 | TBD |
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| Apr 14 | TBD |
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| Apr 21 | TBD |
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