The Light Cone in String Theory

Abstract

The causal boundary of string propagation -- defined as the hypersurface in loop space bordering the timelike(spacelike) domains in which two successive measurements of the string field do(do not) interfere with one another -- is argued to be $0=\int d\sigma (\delta X(\sigma ){)}^2={\sum }_{\ell =-\infty }^{\infty }\delta x_{-\ell }^{\mu }\delta x_{\mu \ell }.$ Some possible consequences are discussed.

9 pages; some minor errors corrected; discussion section expanded

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