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I have been reading the paper: Bubbling Ads space and the 1/2 BPS geometries[hep-th/0409174]. In the paper they look at 1/2 BPS states in the field theory which are dual to D3 branes IIB supegravity. The D3 branes couple to a four form potential . I would like to ask, why is it that the D3 brane couples to a four form potential?
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