The globally F-regular type implies log Fano conjecture

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Let XX be a projective variety of characteristic zero. A variety is globally F-regular type if it has globally F-regular reductions modulo a Zariski-dense set of primes, and it is log Fano if there is an effective Q\mathbb Q-divisor Δ\Delta such that (X,Δ)(X,\Delta) is Kawamata log terminal and −(KX+Δ)-(K_X+\Delta) is ample.

Globally F-regular type implies log Fano. A projective globally F-regular type variety of characteristic zero is log Fano.

The converse to the corresponding positive-characteristic implication is open in general. It is known under the additional hypothesis that the variety is a Q\mathbb Q-factorial Mori Dream space; if true in general, the conjecture would also imply that globally F-regular type varieties are Mori Dream spaces.

References

Primary source

Karen E. Smith and Wenliang Zhang, “Frobenius Splitting in Commutative Algebra”, arXiv:1409.1169 (2014).

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