Mapping class group actions on configuration spaces and the Johnson filtration

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Let Fng,1) denote the configuration space of n ordered points on the surface Σg,1 and let Γg,1 denote the mapping class group of Σg,1. We prove that the action of Γg,1 on Hi(Fng,1); ℤ) is trivial when restricted to the ith stage of the Johnson filtration J(i) ⊂ Γg,1. We give examples showing that J(2) acts nontrivially on H3(F3g,1)) for g ≥ 2, and provide two new conceptual reinterpretations of a certain group introduced by Moriyama.

Original languageEnglish
JournalTransactions of the American Mathematical Society
Volume375
Issue number8
Pages (from-to)5461-5489
ISSN0002-9947
DOIs
Publication statusPublished - 2022

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