Odaka's asymptotics conjecture for complete Ricci-flat Kähler metrics

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Let XoX^{o} be a non-proper separated complex variety with at most Kawamata log terminal singularities, carrying a complete Ricci-flat weak Kähler metric gg and a base point pp. Suppose

vol⁡(B(p,r))∼crd\operatorname{vol}(B(p,r))\sim c r^{d}

as r→+∞r\to+\infty, and define the volume growth dimension by vg(Xo,g)=d{\rm vg}(X^{o},g)=d. If vg(Xo,g)>dim⁡C(X){\rm vg}(X^{o},g)>\dim_{\mathbb C}(X), let κˉ(Xo)\bar\kappa(X^{o}) denote the logarithmic Iitaka dimension; if Xo=X∖Supp⁡(D)X^{o}=X\setminus\operatorname{Supp}(D) for a smooth projective XX and a simple normal crossing divisor D∈∣−KX∣D\in|-K_X|, let Δ~(D)\widetilde\Delta(D) denote the dual intersection cone complex and (Xo)an(X^{o})^{\rm an} its Berkovich analytification for the trivial valuation. Asymptotics conjecture. (1) If vg(Xo,g)>dim⁡C(X){\rm vg}(X^{o},g)>\dim_{\mathbb C}(X), then κˉ(Xo)=−∞\bar\kappa(X^{o})=-\infty, and every compactification XX is uniruled. (2) In the stated log-smooth anticanonical compactification case,

dim⁡RΔ~(D)=dim⁡(Xo)an≤vg(Xo,g)≤dim⁡R(X)=2dim⁡C(X).\dim_{\mathbb R}\widetilde\Delta(D)=\dim (X^{o})^{\rm an}\le {\rm vg}(X^{o},g)\le \dim_{\mathbb R}(X)=2\dim_{\mathbb C}(X).

These expected relations connect metric volume growth with logarithmic birational geometry and the dual complex; the source gives no resolution.

References

Primary source

Yuji Odaka, “Polystable log Calabi-Yau varieties and Gravitational instantons”, arXiv:2009.13876 (2020).

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