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An invariant string propagator. (English) Zbl 0649.58009
Unified string theories, Workshop, Santa Barbara/Calif. 1985, 568-576 (1986).
Summary: [For the entire collection see Zbl 0645.00001.]
We show that the Polyakov path integral can be used to define off-shell quantities in string theory.

58D30 Applications of manifolds of mappings to the sciences
81S40 Path integrals in quantum mechanics
Zbl 0645.00001