BIRS Workshop Lecture Videos

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BIRS Workshop Lecture Videos

Fox-Neuwirth cells, quantum shuffle algebras, and the homology of braid groups Westerland, Craig


The notion of a braided vector space \(V\) comes from the Hopf algebra community, and examples abound, from conjugacy classes in groups to braidings coming from Cartan matrices. From this definition, the tensor powers of \(V\) form a family of braid group representations. They also may be assembled into a non-commutative, non-cocommutative braided Hopf algebra called a quantum shuffle algebra. Our main result identifies the homology of the braid groups with these coefficients as the cohomology of this algebra. Using change of rings spectral sequences, we begin to get a handle on these homology groups. If time permits, we will discuss applications to conjectures in arithmetic statistics. This is joint work with TriThang Tran and Jordan Ellenberg.

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