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Paper IPM / P / 6777  


Abstract:  
We explicitly evaluate the disk Smatrix elements of one closed string and an arbitrary number of open string states in the presence of a large background Bflux. From this calculation, we show that in the worldvolume action of Dbranes in terms of noncommutative fields, the closed string fields must be treated as functionals of the noncommutative gauge fields. We also find the generalized multiplication rule *_{N} between N open string fields on the worldvolume of the Dbrane. In particular, this result indicates that the difference between the familiar * and the *_{N} product is just some total derivative terms. We show that the *_{N} product and the dependence of the closed string fields on the noncommutative gauge fields emerge also from transforming the ordinary DiracBornInfeld action(including the closed string fields) under the SeibergWitten map. We then conjecture a noncommutative DBI action for the transformation of the commutative DBI action under the SW map.
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