On log K-stability for asymptotically log Fano varieties

The notion of asymptotically log Fano varieties was given by Cheltsov and Rubinstein. We show that, if an asymptotically log Fano variety $(X, D)$ satisfies that $D$ is irreducible and $-K_X-D$ is big, then $X$ does not admit Kähler-Einstein edge metrics with angle $2πβ$ along $D$ for any sufficiently small positive rational number $β$. This gives an affirmative answer to a conjecture of Cheltsov and Rubinstein.

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