The heterotic G${}_2$-system on 2-step nilmanifolds endowed with principal torus bundles

Abstract

We study the geometric heterotic G${}_2$-system on 7-dimensional 2-step nilmanifolds $M=\Gamma \backslash N$ endowed with principal torus bundles and with a prescribed flat tangent bundle instanton. We first prove that every invariant G${}_2$-structure solving the system must be coclosed when the dimension of the commutator of $N$ is $1$ or $2$, and under an additional calibration assumption when the dimension is $3$. Then, we discuss the existence of solutions for all possible isomorphism classes of 7-dimensional 2-step nilpotent Lie algebras, and we provide examples with constant dilaton function.

37 pages. Final version, to appear in Advances in Theoretical and Mathematical Physics