On the Four-Dimensional Effective Action of Strongly Coupled Heterotic String Theory

Details On the Four-Dimensional Effective Action of Strongly Coupled Heterotic String Theory On the Four-Dimensional Effective Action of Strongly Coupled Heterotic String Theory

1997-10-28

arxiv.org/abs/hep-th/9710208v2

Nucl.Phys. B532 (1998) 43-82

Physics

High Energy Physics

High Energy Physics - Theory

40 pages, Latex, changes in references, error in factors corrected, typos removed

Scientific paper

10.1016/S0550-3213(98)00463-5

The low-energy D=4, N=1 effective action of the strongly coupled heterotic string is explicitly computed by compactifying Horava-Witten theory on the deformed Calabi-Yau three-fold solution due to Witten. It is shown that, to order kappa^{2/3}, the Kahler potential is identical to that of the weakly coupled theory. Furthermore, the gauge kinetic functions are directly computed to order kappa^{4/3} and shown to receive a non-vanishing correction. Also, we compute gauge matter terms in the Kahler potential to the order kappa^{4/3} and find a nontrivial correction to the dilaton term. Part of those corrections arise from background fields that depend on the orbifold coordinate and are excited by four-dimensional gauge field source terms.

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