Abstract
The gauge-fixed action of a "spacetime-filling" D3-brane with dilaton–axion coupling is formulated in N=1 superspace. We investigate its symmetries by paying special attention to a possible nonlinearly realized extra supersymmetry, and emphasize the need of a linear superfield coupled to an Abelian Chern–Simons superfield to represent a dilaton–axion supermultiplet in the off-shell manifestly supersymmetric approach.
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