Using the compatibility of the DBI and the Chern-Simons actions with the T-duality transformations, we extend the curvature corrections to these actions to include the quadratic B-field couplings at order O( alpha ^2) . We then use...

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investment in the various economic sectors. With th is point the study explores the role of the governm ent monetary and

fiscal policies in decrease or increase of economic duality in Iran. For this aim data of 1973-2003 was used...

We use compatibility of D-brane action with linear T-duality, S-duality and with S-matrix elements as guiding principles to find all world volume couplings of one massless closed and two open strings at order $\\alpha'^2$ in type II...

Recently, it has been shown that the NS-NS corrections to the type II supergravity given by Gross and Sloan are invariant under the linear T-duality. In this paper, we study the invariance of this action under sequence of S-duality...

We use compatibility of O-plane action with nonlinear T-duality as a guiding principle to find all NS-NS couplings in the O-plane action at order $\\alpha'^2$. We find that the dilaton couplings appear in the string frame only via...

Recently, it has been observed that in a T-duality invariant world-volume theory in at spacetime, all orders of gauge field strength and all orders of the D-brane velocity appear in two specific matrices. Using these two matrices, we construct...

Using the compatibility of the DBI and the Chern-Simons actions with the T-duality transformations, the curvature corrections to these actions have been recently extended to include the quadratic B-field couplings at order O(α′2...

are important for understanding the stringy behavior of the fundamental objects. They may be extracted from the contact terms of the corresponding S-matrix elements. On the other hand, the superstring theories enjoy the T- and S-dualities which appear...

of two $R^4$ terms become identical. The Riemann curvature couplings that the T-duality constraint produces for both type II and Heterotic theories are fully consistent with the existing couplings in the literature which have been found by the S...

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 F(p) = dC(p−1) where

C = e...