Nonlinear Supersymmetry Without the GSO Projection and Unstable D9-Brane
نویسنده
چکیده
Orientable open string theories containing both bosons and fermions without the GSO projection are expected to have the 10 dimensional N = 2(A) space-time supersymmetry in a spontaneously broken phase. We study the low-energy theorem for the nonlinearly realized N = 2 supersymmetry using the effective action for an unstable D9-brane. It is explicitly confirmed that the 4-fermion open string amplitudes without the GSO projection obey the low-energy theorem derived from the nonlinear N = 2 supersymmetry. An intimate connection between the existence of the hidden supersymmetry and the openopen string (s-t) duality is pointed out. ∗ e-mail address: [email protected] † e-mail address: [email protected]
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