Non-BPS brane dynamics and duality

The Green-Schwarz action for a non-BPS p = 2 brane embedded in a N = 1, D = 4 target superspace is shown to be equivalent to the Nambu-Goto-Akulov-Volkov action obtained via the nonlinear realization of the associated target space super-Poincaré symmetries. Introducing a U(1) gauge field strength as a Lagrange multiplier, this p = 2 brane action is recast into its equivalent dual form non-BPS D2-brane Born-Infeld action. Following the procedure given by Sen, the Green-Schwarz action for a non-BPS D2-brane is determined directly. From it, conversely, the dual form non-BPS p = 2 brane action is derived. The p = 2 brane and the D2-brane actions obtained by these two approaches are different in form. Through explicitly determined field redefinitions, these actions are shown to be equivalent.