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arXiv · 2512.16817

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

Andrei Moroianu·Alberto Raffero·Luigi Vezzoni
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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.

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Andrei Moroianu, Alberto Raffero, Luigi Vezzoni. 2025-12-18. The heterotic G$_2$-system on 2-step nilmanifolds endowed with principal torus bundles. https://arxiv.org/abs/2512.16817

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