Towards logarithmic GLSM : the r–spin case

Chen, Qile¹ ; Janda, Felix² ; Ruan, Yongbin³ ; Sauvaget, Adrien⁴

¹ Department of Mathematics, Boston College, Chestnut Hill, MA, United States
² Department of Mathematics, University of Notre Dame, Notre Dame, IN, United States
³ Institute for Advanced Study in Mathematics, Zhejiang University, Hangzhou, China
⁴ Institut de Mathématiques de Jussieu, Université Pierre et Marie Curie, Paris, France, CNRS, Université de Cergy–Pontoise, Laboratoire de Mathématiques AGM, UMR 8088, Cergy-Pontoise, France

Geometry & topology, Tome 26 (2022) no. 7, pp. 2855-2939.

Résumé

We establish the logarithmic foundation for compactifying the moduli stacks of the gauged linear sigma model using stable log maps. We then illustrate our method via the key example of Witten’s $r$–spin class to construct a proper moduli stack with a reduced perfect obstruction theory whose virtual cycle recovers the $r$–spin virtual cycle of Chang, Li and Li. Indeed, our construction of the reduced virtual cycle is built upon their work by appropriately extending and modifying the Kiem–Li cosection along certain logarithmic boundary. In a follow-up article, we push the technique to a general situation.

One motivation of our construction is to fit the gauged linear sigma model in the broader setting of Gromov–Witten theory so that powerful tools such as virtual localization can be applied. A project along this line is currently in progress, leading to applications including computing loci of holomorphic differentials, and calculating higher-genus Gromov–Witten invariants of quintic threefolds.

Détail

DOI : 10.2140/gt.2022.26.2855

Classification : 14D23, 14N35
Keywords: $r$–spin, stable logarithmic maps, virtual cycles

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