ScalingStacks

Proposition 2.2 . [04YD]

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Proposition 2.2.

Suppose U⊂U¯hyb​(𝒳)U\subset\overline{U}^{\rm hyb}(\mathcal{X}) is a Morgan-Shalen-Boucksom-Jonsson compactification associated to an arbitrary dlt stacky pair (𝒳,𝒟)(\mathcal{X},\mathcal{D}) of boundary coefficients 11 ([Od16]) with 𝒰:=𝒳∖𝒟\mathcal{U}:=\mathcal{X}\setminus\mathcal{D}, its coarse moduli space 𝒰→U\mathcal{U}\to U. Then for any holomorphic morphism Δ∗:={z∈ℂ∣0<|z|<1}→𝒰\Delta^{*}:=\{z\in\mathbb{C}\mid 0<|z|<1\}\to\mathcal{U} which extend to Δ:={z∈ℂ∣|z|<1}→𝒳\Delta:=\{z\in\mathbb{C}\mid|z|<1\}\to\mathcal{X}, it induces a continuous map Δ→U¯hyb​(𝒳)\Delta\to\overline{U}^{\rm hyb}(\mathcal{X}), i.e., the limit exists. Furthermore, such possible limits in Δ⁡(𝒟)\Delta(\mathcal{D}) are characterized as points with rational coordinates.

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