Although it is not known how to covariantly quantize the Green-Schwarz (GS) superstring, there exists a semi-light-cone gauge choice in which the GS superstring can be quantized in a conformally invariant manner. In this paper, we prove that BRST quantization of the GS superstring in semi-light-cone gauge is equivalent to BRST quantization using the pure spinor formalism for the superstring

We construct the covariant κ-symmetric superstring action for type IIB superstring on plane wave space supported by Ramond-Ramond background. The action is defined as a 2d sigma-model on the coset superspace. We fix the fermionic and bosonic light-cone gauges in the covariant Green-Schwarz superstring action and find the light-cone string Lagrangian and the Hamiltonian. The resulting light-cone...

We point out that off-shell four-dimensional spacetime-supersymmetry implies strange hermiticity properties for the N=1 RNS superstring. However, these hermiticity properties become natural when the N=1 superstring is embedded into an N=2 superstring.

Abstract We construct open-closed superstring interactions based on the homotopy algebra structure. This provides a classical open field theory general closed-superstring-field backgrounds described by solutions of nonlinear equation motion closed theory. also give corresponding WZW-like action through map connecting homotopy-based and formulations.

I discuss the construction of realistic superstring standard–like models in the four dimensional free fermionic formulation. I discuss proton lifetime constraints on superstring models. I discuss the massless spectrum of the superstring standard–like models, the texture of fermion mass matrices in these models and argue that the realistic features of these models are due to the underlying Z2 × ...

I discuss the construction of realistic superstring standard–like models in the four dimensional free fermionic formulation. I discuss proton lifetime constraints on superstring models. I discuss the massless spectrum of the superstring standard–like models, the texture of fermion mass matrices in these models and argue that the realistic features of these models are due to the underlying Z2 × ...

I review the construction of an action for open superstring field theory which does not suffer from the contact term problems of other approaches. I also discuss a possible generalization of this action for closed superstring field theory. (Talk presented at 32 Ahrenshoop International Symposium on Elementary Particle Theory in Buckow, Germany) 1 Problems with Conventional Approach The construc...