SCHILD ACTION AND SPACE-TIME UNCERTAINTY PRINCIPLE IN STRING THEORY

We discuss the meaning of the Schild action from the viewpoint of a po ssible space-time uncertainty principle in string theory and present a n interpretation of the Schild action which points toward a derivation of superstring theory as a theory of quantized space-time where the s quared string scale, l(s)(2) similar to alpha', plays the role of the minimum quantum for space-time areas. A tentative approach toward such a goal is proposed, based on a microcanonical formulation of a large N supersymmetric matrix model.