SU(N) transitions in M-theory on Calabi-Yau fourfolds and background fluxes

TL;DR

This paper explores the geometric and flux configurations in M-theory on Calabi-Yau fourfolds with $A_{N-1}$ singularities, linking gauge theory branches to geometric transitions and flux backgrounds.

Contribution

It establishes a detailed correspondence between Coulomb and Higgs branches of 3D $SU(N)$ gauge theories and geometric transitions in Calabi-Yau fourfolds with fluxes, extending previous models.

Findings

Higgs branch corresponds to deformed Calabi-Yau fourfolds with fluxes.

Coulomb branch corresponds to resolved Calabi-Yau fourfolds.

Explicit examples demonstrate phase transitions in weighted projective and toric varieties.

Abstract

We study M-theory on a Calabi-Yau fourfold with a smooth surface $S$ of $A_{N-1}$ singularities. The resulting three-dimensional theory has a $\mathcal{N}=2$ $SU(N)$ gauge theory sector, which we obtain from a twisted dimensional reduction of a seven-dimensional $\mathcal{N}=1$ $SU(N)$ gauge theory on the surface $S$. A variant of the Vafa-Witten equations governs the moduli space of the gauge theory, which, for a trivial $SU(N)$ principal bundle over $S$, admits a Coulomb and a Higgs branch. In M-theory these two gauge theory branches arise from a resolution and a deformation to smooth Calabi-Yau fourfolds, respectively. We find that the deformed Calabi-Yau fourfold associated to the Higgs branch requires for consistency a non-trivial four-form background flux in M-theory. The flat directions of the flux-induced superpotential are in agreement with the gauge theory prediction for the moduli space of the Higgs branch. We illustrate our findings with explicit examples that realize the Coulomb and Higgs phase transition in Calabi-Yau fourfolds embedded in weighted projective spaces. We generalize and enlarge this class of examples to Calabi-Yau fourfolds embedded in toric varieties with an $A_{N-1}$ singularity in codimension two.