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Stable logarithmic maps to Deligne-Faltings pairs. II. (English) Zbl 1321.14025
Let \(\mathcal{K}_{\Gamma}(Y)\) be the stack parametrizing stable logarithmic maps of log-smooth curves into a logarithmic scheme \(Y\) with the relevant numerical data \(\Gamma\), such as genus, marked points, curve class and other indicators (contact orders), related to the logarithmic structure. It was proved in [Q. Chen, Ann. Math. (2) 180, No. 2, 455–521 (2014; Zbl 1311.14028)] that \(\mathcal{K}_{\Gamma}(Y)\) is algebraic and proper when the logarithmic structure of \(Y\) is given by a line bundle with a section, and more generally in [M. Gross and B. Siebert, J. Am. Math. Soc. 26, No. 2, 451–510 (2013; Zbl 1281.14044)]. The motivating case in [Zbl 1311.14028] is that of a pair \((\underline{Y}, \underline{D})\), where \(\underline{D}\) is a smooth divisor in the smooth locus of the scheme \(\underline{Y}\) underlying \(Y\). Based on this special case, in the paper under review the authors observe that one can give a “pure-throught” proof of algebraicity and properness of the stack \(\mathcal{K}_{\Gamma}(Y)\) whenever \(Y\) is a Deligne-Faltings logarithmic structure (Theorem 2.6). This observation covers a number of the cases of interest, such as a variety with a simple normal crossings divisor, or a simple normal crossings degeneration of a variety with a simple normal crossings divisors. The authors further extend the result to some more general settings (Theorems 3.15 and 5.7).

14H10 Families, moduli of curves (algebraic)
14N35 Gromov-Witten invariants, quantum cohomology, Gopakumar-Vafa invariants, Donaldson-Thomas invariants (algebro-geometric aspects)
14D23 Stacks and moduli problems
14A20 Generalizations (algebraic spaces, stacks)
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