Moduli of finite flat torsors over nodal curves
Publication date
2025-07
Authors
Mehidi, Sara
Poiret, Thibault
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Document Type
Article
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Abstract
We show that log flat torsors over a family (Formula presented.) of nodal curves under a finite flat commutative group scheme (Formula presented.) are classified by maps from the Cartier dual of (Formula presented.) to the log Jacobian of (Formula presented.). We deduce that fppf torsors on the smooth fiberss of (Formula presented.) can be extended to global log flat torsors under some regularity hypotheses.
Keywords
General Mathematics
Citation
Mehidi, S & Poiret, T 2025, 'Moduli of finite flat torsors over nodal curves', Journal of the London Mathematical Society, vol. 112, no. 1, e70220, pp. 1-33. https://doi.org/10.1112/jlms.70220