Journal of High Energy Physics, ( ISI ), Volume (10), No (103), Year (2013-10) , Pages (1-16)

Title : ( S-duality invariant dilaton couplings at order α′3 )

Authors: Mohammad Reza Garousi ,

Citation: BibTeX | EndNote

The Riemann curvature correction to the type II supergravity at eight-derivative level is given schematically as (t_8t_8+ frac{1}{8} eps_{10} eps_{10})R^4 at tree-level. The replacement of the generalized Riemann curvature in t_8t_8R^4 , proposed by Gross and Sloan, produces various NS-NS couplings which are invariant under T-duality. Recently, using the combination of S-duality and T-duality transformations on these couplings, we have found groups of couplings which are invariant under the S-duality transformation. In this paper, we have examined the couplings involving the dilaton with direct scattering amplitude calculations of four NS-NS vertex operators in the superstring theory and found exact agreement. The coupling eps_{10} eps_{10}R^4 is a total derivative term at four-field level. The sigma -model beta function approach implies the presence of this term at the tree-level. By examining the sphere-level scattering amplitude of five gravitons, we have also confirmed the presence of this term in the tree-level effective action.

Keywords

, Dilaton coupling, S-duality,
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@article{paperid:1036652,
author = {Garousi, Mohammad Reza},
title = {S-duality invariant dilaton couplings at order α′3},
journal = {Journal of High Energy Physics},
year = {2013},
volume = {10},
number = {103},
month = {October},
issn = {1029-8479},
pages = {1--16},
numpages = {15},
keywords = {Dilaton coupling; S-duality; S-matrix},
}

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%0 Journal Article
%T S-duality invariant dilaton couplings at order α′3
%A Garousi, Mohammad Reza
%J Journal of High Energy Physics
%@ 1029-8479
%D 2013

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