Higher length-twist coordinates for character varieties

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• Omar Kidwai (Toronto)
• Wednesday 27 February 2019, 14:00-15:00
• Watson Building (Mathematics, R15 on map) Lecture Room B.

If you have a question about this talk, please contact Andrea Brini.

We describe joint work with L. Hollands on a construction of special holomorphic Darboux coordinates on certain SL_N (particularly N=2,3) character varieties. We consider degenerate examples of “spectral networks” of Gaiotto-Moore-Neitzke (certain graphical objects on a Riemann surface), generalizing the so-called “Fenchel-Nielsen” networks of Hollands-Neitzke. We compute the associated “spectral coordinates” using the “abelianization map”, taking connections on the Riemann surface to abelian holonomy data on a spectral cover, generalizing the “complexified Fenchel-Nielsen” coordinates of Kourouniotis-Tan for SL(2)-connections to higher rank. Time permitting, I will discuss some physical applications to computing superpotentials coming from 4d N=2 supersymmetric QFTs.

This talk is part of the Geometry and Mathematical Physics seminar series.

This talk is included in these lists:

• Bham Talks
• Geometry and Mathematical Physics seminar
• School of Mathematics events
• Watson Building (Mathematics, R15 on map) Lecture Room B

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