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• W771721504 abstract "For a Fano variety V with at most Kawamata log terminal (klt) singularities and a finite group G acting bi-regularly on V , we say that V is G-exceptional (resp., G-weakly-exceptional) if the log pair ( V ,∆ ) is klt (resp., log canonical) for all G-invariant effectiveQ-divisors∆ numerically equivalent to the anti-canonical divisor of V . Such G-exceptional klt Fano varieties V are conjectured to lie in finitely many families by Shokurov ([Sho00, Pro01]). The only cases for which the conjecture is known to hold true are when the dimension of V is one, two, or V is isomorphic to n-dimensional projective space for some n. For the latter, it can be shown that G must be primitive — which implies, in particular, that there exist only finitely many such G (up to conjugation) by a theorem of Jordan ([Pro00]). Smooth G-weakly-exceptional Fano varieties play an important role in non-rationality problems in birational geometry. From the work of Demailly (see [CS08, Appendix A]) it follows that Tian’s αG -invariant for such varieties is no smaller than one, and by a theorem of Tian such varieties admit G-invariant Kahler-Einstein metrics. Moreover, for a smooth G-exceptional Fano variety and given any G-invariant Kahler form in the first Chern class, the Kahler-Ricci iteration converges exponentially fast to the Kahler form associated to a KahlerEinstein metric in the C∞(V )-topology. The term exceptional is inherited from singularity theory, to which this study enjoys strong links. We classify two-dimensional smooth G-exceptional Fano varieties (del Pezzo surfaces) and provide a partial list of all G-exceptional and G-weakly-exceptional pairs ( S,G ) , where S is a smooth del Pezzo surface and G is a finite group of automorphisms of S. Our classification confirms many conjectures on two-dimensional smooth exceptional Fano varieties." @default.
• W771721504 created "2016-06-24" @default.
• W771721504 creator A5085293196 @default.
• W771721504 date "2010-01-01" @default.
• W771721504 modified "2023-09-26" @default.
• W771721504 title "Smooth exceptional del Pezzo surfaces" @default.
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