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Xiyan Zhong

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Preprint Jul 2026

Abelianization of Symmetric Mapping Class Groups

Let $\widetilde{S}\to S$ be an unbranched regular $p$-fold cyclic cover of a closed orientable surface $S$ of genus $g$. Two natural groups are associated to this cover. The first is the centralizer $\mathrm{Mod}(\widetilde{S},\sigma)$ of a chosen generator $\sigma$ of the deck transformation group in $\mathrm{Mod}(\wi...

Xiyan Zhong · 0 citations
Preprint Aug 2026

Rigidity of the period map up to finite covers

We first give a complete classification of bi-affine representations of mapping class groups of surfaces with finitely many boundary components or punctures. We also show that every linear representation of the mapping class group of a genus-$g$ surface with two boundary components of dimension at most $3g-3$ is bi-aff...

Xiyan Zhong · 0 citations
Preprint Jul 2026

Abelianization of Symmetric Mapping Class Groups

Let $\widetilde{S}\to S$ be an unbranched regular $p$-fold cyclic cover of a closed orientable surface $S$ of genus $g$. Two natural groups are associated with this cover. The first is the centralizer in $\mathrm{Mod}(\widetilde{S})$ of a chosen generator $\sigma$ of the deck transformation group, denoted by $\mathrm{M...

Xiyan Zhong · 0 citations

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