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VOLUME 58 (1993) | ISSUE 11 | PAGE 925
Causality and Kallen-Lehmann-Like representation of the fermionic stringy propagator
A spectral representation for the Green functions of the free fermionic Ramond-Neveu-Schwarz string is obtained. It is valid for any initial and final string configurations and manifests an exponential growth of spectral densities intrinsic in nonlocalizable theories. Causal and singular properties of the propagators are considered.