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Decomposition of degenerate Gromov–Witten invariants

Published online by Cambridge University Press:  19 November 2020

Dan Abramovich
Affiliation:
Department of Mathematics, Brown University, Box 1917, Providence, RI 02912, USA dan_abramovich@brown.edu
Qile Chen
Affiliation:
Department of Mathematics, Boston College, Chestnut Hill, MA 02467-3806, USA qile.chen@bc.edu
Mark Gross
Affiliation:
DPMMS, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WB, UK mgross@dpmms.cam.ac.uk
Bernd Siebert
Affiliation:
Department of Mathematics, The University of Texas at Austin, 2515 Speedway, Austin, TX 78712, USA siebert@math.utexas.edu

Abstract

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.

Type
Research Article
Copyright
© The Author(s) 2020

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Footnotes

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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