ScalingStacks

Theorem 1.1 . [030N]

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Theorem 1.1.

If MM is projective and if one (and hence all) of the fibers MyM_{y} with y∈N\f⁡(S)y\in N\backslash f(S) is a torus, then as tt approaches zero the Ricci–flat metrics ω~t\tilde{\omega}_{t} converge in Cloc∞​(M\S,ωM)C^{\infty}_{\mathrm{loc}}(M\backslash S,\omega_{M}) to f∗​ωf^{*}\omega, where ω\omega is a Kähler metric on N\f⁡(S)N\backslash f(S) with Ric⁡(ω)=ωWP\Ric(\omega)=\omega_{\rm WP}. Given any compact set K⊂M\SK\subset M\backslash S there is a constant CKC_{K} such that the sectional curvature of ω~t\tilde{\omega}_{t} satisfies

(1.2) supK|Sec⁡(ω~t)|⩽CK,\sup_{K}|\mathrm{Sec}(\tilde{\omega}_{t})|\leqslant C_{K},

for all small t>0t>0. Furthermore, on each torus fiber MyM_{y} with y∈N\f⁡(S)y\in N\backslash f(S) we have

(1.3) ω~t|Myt→ωS​F,y,\frac{\tilde{\omega}_{t}|_{M_{y}}}{t}\to\omega_{SF,y},

where ωS​F,y\omega_{SF,y} is the unique flat metric on MyM_{y} cohomologous to ωM|My\omega_{M}|_{M_{y}} and the convergence is smooth and uniform as yy varies on a compact subset of N\f⁡(S)N\backslash f(S).

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