New Solutions to the $G_2$ Hull-Strominger System via torus fibrations over $K3$ orbifolds

Abstract

Using torus fibrations over K3 orbisurfaces, we construct new smooth solutions to the $G_2$ Hull-Strominger system. These manifolds arise as total spaces of principal $T^3$ (orbi)bundles over singular K3 surfaces. Our construction is based on the choice of three divisors on a singular K3 surface that are primitive with respect to a particular Kählermetric. The stable bundle is obtained via an adaptation of the Serre construction to the singular setting.

20 pages. Final Version. To appear in Annales Henri Poincaré