Existence of a divisor computing the global log canonical threshold of a Fano variety

Let XX be a Fano variety with log terminal singularities. An effective Q\mathbb{Q}-divisor DD on XX satisfies DKXD\equiv -K_X.

Global threshold conjecture. For some such divisor DD, one has

lct(X)=lct(X,D).\mathrm{lct}\big(X\big)=\mathrm{lct}\big(X,D\big).

This conjecture asks whether the global log canonical threshold of a Fano variety is attained by a single effective anticanonical Q\mathbb{Q}-divisor. It is inspired by a question of Tian; the supplied source does not establish a general resolution.

Sources & referencesView supporting material

Primary source

Ivan Cheltsov, “Log canonical thresholds of del Pezzo surfaces”, arXiv:math/0703175 (2008).

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