| Autor: |
Geraschenko, Anton, Satriano, Matthew |
| Předmět: |
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| Zdroj: |
Journal of the London Mathematical Society; Dec2015, Vol. 92 Issue 3, p736-759, 24p |
| Abstrakt: |
This article is motivated by the following local-to-global question: is every variety with tame quotient singularities globally the quotient of a smooth variety by a finite group? We show that the answer is 'yes' for quasi-projective varieties which are expressible as a quotient of a smooth variety by a split torus (for example, quasi-projective simplicial toric varieties). Although simplicial toric varieties are rarely toric quotients of smooth varieties by finite groups, we give an explicit procedure for constructing the quotient structure using toric techniques. The main result follows from a characterization of varieties which are expressible as the quotient of a smooth variety by a split torus. As an additional application of this characterization, we show that a variety with abelian quotient singularities may fail to be a quotient of a smooth variety by a finite abelian group. Concretely, we show that P²/A5 is not expressible as a quotient of a smooth variety by a finite abelian group. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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