Published online by Cambridge University Press: 19 November 2020
We prove a decomposition formula of logarithmic Gromov–Witten invariants in a degeneration setting. A one-parameter log smooth family $X \longrightarrow B$ with singular fibre over
$b_0\in B$ yields a family
$\mathscr {M}(X/B,\beta ) \longrightarrow B$ of moduli stacks of stable logarithmic maps. We give a virtual decomposition of the fibre of this family over
$b_0$ in terms of rigid tropical maps to the tropicalization of
$X/B$. This generalizes one aspect of known results in the case that the fibre
$X_{b_0}$ is a normal crossings union of two divisors. We exhibit our formulas in explicit examples.
Research by D.A. was supported in part by NSF grants DMS-1162367, DMS-1500525 and DMS-1759514. Research by Q.C. was supported in part by NSF grant DMS-1403271 and DMS-1560830. M.G. was supported by NSF grant DMS-1262531, EPSRC grant EP/N03189X/1 and a Royal Society Wolfson Research Merit Award. Research by B.S. was partially supported by NSF grant DMS-1903437.
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