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Gluing of Branched Surfaces by Sewing of Fermionic String Vertices

We glue together two branched spheres by sewing of two Ramond (dual) two-fermion string vertices and present a rigorous analytic derivation of the closed expression for the four-fermion string vertex. This method treats all oscillator levels collectively and the obtained answer verifies that the closed form of the four vertex previously argued for on the basis of explicit results restricted to the first two oscillator levels is the correct one.

preprint1993arXivOpen access
Bengt E. W. NilssonPer Sundell
hep-th
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Bengt E. W. NilssonPer Sundell

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