Torus invariant divisors (bibtex)

by Lars Petersen, Hendrik Süß

Abstract:

Using the language of polyhedral divisors and divisorial fans we describe invariant divisors on normal varieties X which admit an effective codimension one torus action. In this picture X is given by a divisorial fan on a smooth projective curve Y. Cartier divisors on X can be described by piecewise affine functions h on the divisorial fan S whereas Weil divisors correspond to certain zero and one dimensional faces of it. Furthermore we provide descriptions of the divisor class group and the canonical divisor. Global sections of line bundles O(D_h) will be determined by a subset of a weight polytope associated to h, and global sections of specific line bundles on the underlying curve Y.

Reference:

Torus invariant divisors (Lars Petersen, Hendrik Süß), Israel Journal of Mathematics, volume 182, 2011.

Bibtex Entry:

@article{tidiv, author = {Lars Petersen and Hendrik S{\"u}{\ss}}, title = {Torus invariant divisors}, journal = {Israel Journal of Mathematics}, year = 2011, volume= {182}, pages= {481-505}, url={http://arxiv.org/abs/0811.0517}, doi={10.1007/s11856-011-0039-z}, gsid={3050199517086222449}, abstract={Using the language of polyhedral divisors and divisorial fans we describe invariant divisors on normal varieties X which admit an effective codimension one torus action. In this picture X is given by a divisorial fan on a smooth projective curve Y. Cartier divisors on X can be described by piecewise affine functions h on the divisorial fan S whereas Weil divisors correspond to certain zero and one dimensional faces of it. Furthermore we provide descriptions of the divisor class group and the canonical divisor. Global sections of line bundles O(D_h) will be determined by a subset of a weight polytope associated to h, and global sections of specific line bundles on the underlying curve Y. } }

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