We determine explicitly the Picard groups of the universal Jacobian stack and of its compactification over the stack of stable curves. Along the way, we prove some results concerning the gerbe structure of the universal Jacobian stack over its rigidification by the natural action of the multiplicative group and relate this with the existence of generalized Poincaré line bundles. We also compare our results with Kouvidakis-Fontanari computations of the divisor class group of the universal (compactified) Jacobian scheme.
MASCARENHAS MELO, A.m., Viviani, F. (2014). The Picard group of the compactified universal Jacobian. DOCUMENTA MATHEMATICA, 19, 457-507 [10.4171/DM/453].
The Picard group of the compactified universal Jacobian
VIVIANI, FILIPPO
2014-01-01
Abstract
We determine explicitly the Picard groups of the universal Jacobian stack and of its compactification over the stack of stable curves. Along the way, we prove some results concerning the gerbe structure of the universal Jacobian stack over its rigidification by the natural action of the multiplicative group and relate this with the existence of generalized Poincaré line bundles. We also compare our results with Kouvidakis-Fontanari computations of the divisor class group of the universal (compactified) Jacobian scheme.File | Dimensione | Formato | |
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