Predictions for Gromov-Witten invariants of noncommutative resolutions

Abstract

In this paper, we apply recent methods of localized GLSMs to make predictions for Gromov-Witten invariants of noncommutative resolutions, as defined by e.g. Kontsevich, and use those predictions to examine the connectivity of the SCFT moduli space. Noncommutative spaces, in the present sense, are defined by their sheaves, their B-branes. Examples of abstract CFT's whose B-branes correspond with those defining noncommutative spaces arose in examples of abelian GLSMs describing branched double covers, in which the double cover structure arises nonperturbatively. This note will examine the GLSM for P^7[2,2,2,2], which realizes this phenomenon. Its Landau-Ginzburg point is a noncommutative resolution of a (singular) branched double cover of P^3. Regardless of the complex structure of the large-radius P^7[2,2,2,2], the Landau-Ginzburg point is always a noncommutative resolution of a singular space, which begs the question of whether the noncommutative resolution is connected in SCFT moduli space by a complex structure deformation to a smooth branched double cover. Using recent localization techniques, we make a prediction for the Gromov-Witten invariants of the noncommutative resolution, and find that they do not match those of a smooth branched double cover, telling us that these abstract CFT's are not continuously connected to sigma models on smooth branched double covers.

19 pages, LaTeX; v2: typos fixed, references added

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