Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-10-20
Nucl.Phys. B602 (2001) 499-513
Physics
High Energy Physics
High Energy Physics - Theory
18 pages, no figure, further typos are corrected
Scientific paper
10.1016/S0550-3213(01)00090-6
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 open-open string (s-t) duality is pointed out.
Hara Tabito
Yoneya Tamiaki
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