  In this article, we investigate the supersymmetric c=1 model of superstring
theory and demonstrate how the spectrum of states is expanded and new
symmetries of the theory are generated by the existence of ghost cohomologies.
As a result, we establish significant connections between two-dimensional
supergravity and physical theories in higher dimensions. Additionally, we
provide a comprehensive guide for constructing BRST-invariant and nontrivial
vertex operators and carry out explicit computations to determine the
correction terms needed to maintain BRST invariance of the corresponding
currents.
