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Toroidal orbifolds,
destackification, and Kummer blowings up
Dan Abramovich, Michael Temkin and Jarosław WłodarczykAppendix: David Rydh |
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Vol. 14 (2020), No. 8, 2001–2035
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DOI: 10.2140/ant.2020.14.2001
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Abstract |
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We show that any toroidal DM stack with finite diagonalizable inertia possesses a maximal toroidal coarsening such that the morphism is logarithmically smooth. Further, we use torification results of Abramovich and Temkin (2017) to construct a destackification functor, a variant of the main result of Bergh (2017), on the category of such toroidal stacks . Namely, we associate to a sequence of blowings up of toroidal stacks such that coincides with the usual coarse moduli space . In particular, this provides a toroidal resolution of the algebraic space . Both and are functorial with respect to strict inertia preserving morphisms . Finally, we use coarsening morphisms to introduce a class of nonrepresentable birational modifications of toroidal stacks called Kummer blowings up. These modifications, as well as our version of destackification, are used in our work on functorial toroidal resolution of singularities. |
Keywords
algebraic stacks, toroidal geometry, logarithmic schemes,
birational geometry, resolution of singularities
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Mathematical Subject Classification 2010
Primary: 14A20
Secondary: 14E05, 14E15
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Milestones
Received: 7 April 2018
Revised: 1 February 2020
Accepted: 25 March 2020
Published: 18 September 2020
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Authors |
| Dan Abramovich | |
| Brown University Providence, RI United States |
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| Michael Temkin | |
| The Hebrew University of
Jerusalem Jerusalem Israel |
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| Jarosław Włodarczyk | |
| Purdue University West Lafayette, IN United States |
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| David Rydh | |
| KTH Royal Institute of
Technology Stockholm Sweden |
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