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

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.