Bounding the volumes of singular Fano threefolds

Details Bounding the volumes of singular Fano threefolds Bounding the volumes of singular Fano threefolds

2012-04-12

arxiv.org/abs/1204.2593v1

Mathematics

Algebraic Geometry

Scientific paper

Let $(X,\Delta)$ be an $n$-dimensional $\epsilon$-klt log $\QQ$-Fano pair. We give an upper bound for the volume ${\rm Vol}(-(K_X+\Delta))=(-(K_X+\Delta))^n$ when $n=2$ or $n=3$ and $X$ is {$\QQ$-factorial} of $\rho(X)=1$. This bound is essentially sharp for $n=2$. Existence of an upper bound for anticanonical volumes is related the Borisov-Alexeev-Borisov Conjecture which asserts boundedness of the set of $\epsilon$-klt log $\QQ$-Fano varieties of a given dimension $n$.

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