On Supertwistors, the Penrose-Ward Transform and N=4 super Yang-Mills Theory

It was recently shown by Witten that B-type open topological string theory with the supertwistor space CP 3|4 as a target space is equivalent to holomorphic Chern-Simons (hCS) theory on the same space. This hCS theory in turn is equivalent to self-dual N=4 super Yang-Mills (SYM) theory in four dimensions. We review the supertwistor description of self-dual and anti-self-dual N -extended SYM theory as the integrability of super Yang-Mills fields on complex (2|N )-dimensional superplanes and demonstrate the equivalence of this description to Witten’s formulation. The equivalence of the field equations of hCS theory on an open subset of CP 3|N to the field equations of selfdual N -extended SYM theory in four dimensions is made explicit. Furthermore, we extend the picture to the full N=4 SYM theory and, by using the known supertwistor description of this case, we show that the corresponding constraint equations are (gauge) equivalent to the field equations of hCS theory on a quadric in CP 3|3 ×CP . On leave from Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia.