N=2 super-Born-Infeld theory revisited

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Abstract
I discuss the symmetry structure of the N=2 supersymmetric extension of the Born-Infeld action in four dimensions, and confirm its interpretation as the Goldstone-Maxwell action associated with partial breaking of N=4 extended supersymmetry down to N=2, by demonstrating hidden invariance of the action with respect to non-linearly realized (spontaneously broken) symmetries, in the remarkably simple way. I also argue about the uniqueness of supersymmetric extensions of the Born-Infeld action, and their possible relation to noncommutative geometry.

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