  Recently John H. Schwarz put forward a conjecture that the world-volume
action of a probe D3-brane in an AdS5 x S5 background of type IIB superstring
theory can be reinterpreted as the highly effective action (HEA) of
four-dimensional N=4 superconformal field theory on the Coulomb branch. We
argue that the HEA can be derived from the noncommutative (NC) field theory
representation of the AdS/CFT correspondence and the Seiberg-Witten (SW) map
defining a spacetime field redefinition between ordinary and NC gauge fields.
It is based only on the well-known facts that the master fields of large N
matrices are higher-dimensional NC U(1) gauge fields and the SW map is a local
coordinate transformation eliminating U(1) gauge fields known as the Darboux
theorem in symplectic geometry.
