Abstract :
We discuss the NSR formulation of the superstring action on AdS5×S5 proposed recently by Kallosh and Tseytlin in the Green-Schwarz formalism. We show that the stress-energy tensor corresponding to the NSR action for AdS superstring contains the branelike terms, corresponding to exotic massless vertex operators (referred to as the branelike vertices)- the 5-form eφψm1⋯ψm5 and the 3-form ∂(eφψm1⋯ψm3), multiplied by ∂Xm. The corresponding sigma-model action has the manifest SO(1,3)×SO(6) invariance of superstring theory on AdS5×S5. We argue that adding the branelike terms is equivalent to curving the space-time to obtain the AdS5×S5 background. We commence the study of the proposed NSR sigma-model by analyzing the scattering amplitudes involving the branelike vertex operators. The analysis shows quite an unusual momentum dependence of these scattering amplitudes.
