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- W3016760928 abstract "Let l be a prime and G a pro-l group with torsion-free abelianization. We produce group-theoretic analogues of the Johnson/Morita cocycle for G -- in the case of surface groups, these cocycles appear to refine existing constructions when l=2. We apply this to the pro-l etale fundamental groups of smooth curves to obtain Galois-cohomological analogues, and discuss their relationship to work of Hain and Matsumoto in the case the curve is proper. We analyze many of the fundamental properties of these classes and use them to give an example of a non-hyperelliptic curve whose Ceresa class has torsion image under the l-adic Abel-Jacobi map." @default.
- W3016760928 created "2020-04-24" @default.
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- W3016760928 date "2023-03-30" @default.
- W3016760928 modified "2023-10-18" @default.
- W3016760928 title "Group-theoretic Johnson classes and a non-hyperelliptic curve with torsion Ceresa class" @default.
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- W3016760928 doi "https://doi.org/10.46298/epiga.2023.volume7.6849" @default.
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