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Abstract
We construct the logarithmic and tropical Picard groups of a family of logarithmic curves and realize the latter as the quotient of the former by the algebraic Jacobian. We show that the logarithmic Jacobian is a proper family of logarithmic abelian varieties over the moduli space of Deligne–Mumford stable curves, but does not possess an underlying algebraic stack. However, the logarithmic Picard group does have logarithmic modifications that are representable by logarithmic schemes, all of which are obtained by pullback from subdivisions of the tropical Picard group.
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Details
1 ETH Zürich, Rämistrasse 101, CH-8092 Zürich, Switzerland [email protected]
2 University of Colorado, Campus Box 395, Boulder, CO 80309-0395, USA [email protected]