String instantons, fluxes and moduli stabilization. (English) Zbl 1219.81209
Summary: We analyze a class of dual pairs of heterotic and type I models based on freely-acting \(\mathbb Z_2 \times \mathbb Z_2\) orbifolds in four dimensions. Using the adiabatic argument, it is possible to calculate non-perturbative contributions to the gauge coupling threshold corrections on the type I side by exploiting perturbative calculations on the heterotic side, without the drawbacks due to twisted moduli. The instanton effects can then be combined with closed-string fluxes to stabilize most of the moduli fields of the internal manifold, and also the dilaton, in a racetrack realization of the type I model.
MSC:
| 81T30 | String and superstring theories; other extended objects (e.g., branes) in quantum field theory |
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