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VOLUME 44 (1986) | ISSUE 4 | PAGE 157
Vanishing of the vacuum energy for superstrings
A hypothesis regarding the structure of the equations for the vacuum diagrams in a first-quantized theory of superstrings is proposed. The analytic measure in the integral over modulus space is proportional to the sum ÿÅÅ×[Å]4 (ee — ±1) over spin structures on Riemann surfaces and vanishes by virtue of the Riemann identities for θ constants.