Journal of High Energy Physics

, Volume 2011, Issue 2, pp 1–22 | Cite as

On RR couplings on D-branes at order O(α ′2)

  • Mohammad R. Garousi
  • Mozhgan Mir


Recently, it has been found that there are couplings of the RR field strength F (p) and the B-field strength H on the world volume of D p -branes at order \( \mathcal{O}\left( {{\alpha^{{\prime}2}}} \right) \). These couplings which have both world-volume and transverse indices, are invariant under the linear T-duality transformations. Consistency with the nonlinear T-duality indicates that the RR field strength F (p) in these couplings should be replaced by \( {\mathcal{F}^{(p)}} = d{\mathcal{C}^{\left( {p - 1} \right)}} \) where \( \mathcal{C} = {e^B}C \). This replacement, however, produces some non-gauge invariant terms. On the other hand, the nonlinear terms are invariant under the linear T-duality transformations at the level of two B-fields. This allows one to remove some of the nonlinear terms in \( {\mathcal{F}^{(p)}} \). We fix this by comparing the nonlinear couplings with the S-matrix element of one RR and two NSNS vertex operators. Our results indicate that in the expansion of \( {\mathcal{F}^{(p)}} \) one should keep only the B-field gauge invariant terms, e.g., BdC (p−3) where both indices of B-field lie along the brane. Moreover, in this case one should replace B with B + 2παf to have the B-field gauge invariance.


D-branes String Duality 


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Copyright information

© SISSA, Trieste, Italy 2011

Authors and Affiliations

  1. 1.Department of PhysicsFerdowsi University of MashhadMashhadIran

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