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Topology Seminar

Tuesday, 26 November, 2013

SPEAKER: Prof. Jim Conant, UT

TITLE: "An invariant of the Johnson cokernel"

ABSTRACT: Utilizing the action of Aut(F_n) on H^{otimes n} for a cocommutative Hopf algebra H that we defined last week, we will define an invariant of the cokernel of the Johnson homomorphism, which detects large families of new symplectic representations. Of note is that the multiplicities of many of these representations are given by the number of classical modular forms of a given weight.

(Joint with Martin Kassabov)


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