ScalingStacks

Conjecture 2 [03QL]

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Conjecture 2

Let (𝒳m​e​r,v​o​l)=(Xq,v​o​lq)({\cal X}_{mer},vol)=(X_{q},vol_{q}) be a 1-parameter family of maximally degenerate Calabi-Yau manifolds, and Xqn​e​wX_{q}^{new} be the family with rescaled metrics, as before. There exist a constant C>0C>0 and a function t⁑(q)t(q) such that KΓ€hler manifolds Xqn​e​wX_{q}^{new} and XΡ⁑(q),t⁑(q)X^{\varepsilon(q),t(q)} with Ρ⁑(q)=C​(l​o​g​|q|)βˆ’1\varepsilon(q)=C(log|q|)^{-1} are close to each other (as qβ†’0q\to 0) in the following sense:

for any Ξ΄>0\delta>0 there exist a decomposition Xq=Xqs​mβŠ”Xqs​i​n​gX_{q}=X_{q}^{sm}\sqcup X_{q}^{sing} and an embedding of smooth manifolds jq:Xqβ†’pΡ⁑(q),t⁑(q)βˆ’1​(Yβˆ–(Ys​i​n​g)Ξ΄)j_{q}:X_{q}\to p_{\varepsilon(q),t(q)}^{-1}(Y\setminus(Y^{sing})^{\delta}), where (Ys​i​n​g)Ξ΄(Y^{sing})^{\delta} is a Ξ΄\delta-neighborhood of Ys​i​n​gY^{sing}, such that:

a) (Xq,Xqs​i​n​g)(X_{q},X_{q}^{sing}) converges in the Gromov-Hausdorff metric to the pair (YΒ―,Ys​i​n​g)(\overline{Y},Y^{sing}).

b) jqj_{q} identifies up to o⁑(1)o(1) terms, uniformly in x∈Xqs​mx\in X_{q}^{sm}, the scalar products and complex structures on the tangent spaces Tx​XqT_{x}X_{q} and Tjq​(x)​XΡ⁑(q),t⁑(q)T_{j_{q}(x)}X^{\varepsilon(q),t(q)}.

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