Geodesic
The Picard group of the compactified universal Jacobian
Documenta mathematica, Tome 19 (2014), pp. 457-507
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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.
DOI : 10.4171/dm/453
Classification : 14A20, 14C22, 14H10, 14H40, 14L24
Mots-clés : Brauer group, Picard group, universal Jacobian stack and scheme, gm-gerbe, Poincaré line bundle 
@article{10_4171_dm_453,
     author = {Margarida Melo and Filippo Viviani},
     title = {The {Picard} group of the compactified universal {Jacobian}},
     journal = {Documenta mathematica},
     pages = {457--507},
     year = {2014},
     volume = {19},
     doi = {10.4171/dm/453},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/453/}
}
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Margarida Melo; Filippo Viviani. The Picard group of the compactified universal Jacobian. Documenta mathematica, Tome 19 (2014), pp. 457-507. doi: 10.4171/dm/453

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