Abstract
By fibering the duality between the E8 × E8 heterotic string on T3 and M-theory on K3, we study heterotic duals of M-theory compactified on G2 orbifolds of the form T7/\( {\mathbb{Z}}_2^3 \). While the heterotic compactification space is straightforward, the description of the gauge bundle is subtle, involving the physics of point-like instantons on orbifold singularities. By comparing the gauge groups of the dual theories, we deduce behavior of a “half-G2” limit, which is the M-theory analog of the stable degeneration limit of F-theory. The heterotic backgrounds exhibit point-like instantons that are localized on pairs of orbifold loci, similar to the “gauge-locking” phenomenon seen in Hořava-Witten compactifications. In this way, the geometry of the G2 orbifold is translated to bundle data in the heterotic background. While the instanton configuration looks surprising from the perspective of the E8 × E8 heterotic string, it may be understood as T-dual Spin(32)/ℤ2 instantons along with winding shifts originating in a dual Type I compactification.
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Acharya, B.S., Kinsella, A. & Morrison, D.R. Non-perturbative heterotic duals of M-theory on G2 orbifolds. J. High Energ. Phys. 2021, 65 (2021). https://doi.org/10.1007/JHEP11(2021)065
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DOI: https://doi.org/10.1007/JHEP11(2021)065