Let Fn(Σg,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(Fn(Σg,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(F3(Σg,1)) for g ≥ 2, and provide two new conceptual reinterpretations of a certain group introduced by Moriyama.

Bianchi, A., Miller, J., Wilson, J. (2022). Mapping class group actions on configuration spaces and the Johnson filtration. TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, 375(8), 5461-5489 [10.1090/tran/8637].

Mapping class group actions on configuration spaces and the Johnson filtration

Bianchi, Andrea;
2022

Abstract

Let Fn(Σg,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(Fn(Σg,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(F3(Σg,1)) for g ≥ 2, and provide two new conceptual reinterpretations of a certain group introduced by Moriyama.
2022
Bianchi, A., Miller, J., Wilson, J. (2022). Mapping class group actions on configuration spaces and the Johnson filtration. TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, 375(8), 5461-5489 [10.1090/tran/8637].
Bianchi, Andrea; Miller, Jeremy; Wilson, Jennifer
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1038697
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