Torus invariant divisors
Torus invariant divisors
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环面不变除数
DOI:
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发表时间:
2008
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通讯作者:
Hendrik Süß
中科院分区:
文献类型:
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作者:
Lars Petersen;Hendrik Süß
Using the language of Altmann, Hausen and Süß, 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(Dh) 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.