Abstract
We extend our investigations of the open string propagation in the weakly curved background to the case when Kalb-Ramond field, beside the infinitesimal term linear in coordinate B μνρ x ρ, contains the constant term b μν ≠ 0. In two previously investigated cases, for the flat background (b μν ≠ 0 and B μνρ = 0) and the weakly curved one (b μν ≠ 0 and B μνρ = 0) the effective metric is constant and the effective Kalb-Ramond field is zero. In the present article (b μν ≠ 0 and B μνρ = 0) the effective metric is coordinate dependent and there exists non-trivial effective Kalb-Ramond field. It depends on the σ-integral of the effective momentum P μ(σ) = ∫ σ0 dηp μ(η), which is in fact T-dual of the effective coordinate, \( {P_\mu } = \kappa {g_{\mu \nu }}{\tilde{q}^\nu } \). Beside the standard coordinate dependent term θ μν(q), in the non-commutativity parameter, which is nontrivial only on the string end-points, there are additional P μ (or \( {\tilde{q}^\mu } \)) dependent terms which are nontrivial both at the string endpoints and at the string interior. The additional terms are infinitesimally small. The part of one of these terms has been obtained in ref. [22] and the others are our improvements.
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Work supported in part by the Serbian Ministry of Science and Technological Development, under contract No. 171031.
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Davidović, L., Sazdović, B. Non-commutativity parameters depend not only on the effective coordinate but on its T-dual as well. J. High Energ. Phys. 2011, 112 (2011). https://doi.org/10.1007/JHEP08(2011)112
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DOI: https://doi.org/10.1007/JHEP08(2011)112