Canonical divisors on T-varieties

Details Canonical divisors on T-varieties Canonical divisors on T-varieties

2008-11-05

arxiv.org/abs/0811.0626v2

Mathematics

Algebraic Geometry

22 pages, 5 figures; v2: references updated; minor corrections; new remark 4.9. concerning relations to arXiv:1012.0240

Scientific paper

Generalising toric geometry we study compact varieties admitting lower dimensional torus actions. In particular we describe divisors on them in terms of convex geometry and give a criterion for their ampleness. These results may be used to study Fano varieties with small torus actions. As a first result we classify log del Pezzo C*-surfaces of Picard number 1 and Gorenstein index less than 4. In further examples we show how classification might work in higher dimensions and we give explicit descriptions of some equivariant smoothings of Fano threefolds.

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