On the (b, c) system contribution to superstring amplitudes
We use the sewing procedure in the operator formalism to construct explicitly the two-loop vertex for the (b, c) system of string theories in its more general form, needed to compute amplitudes involving picture-changed states. By using this operator we show that the contribution of the reparametriz...
| Autori principali: | , |
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| Natura: | Journal article |
| Lingua: | English |
| Pubblicazione: |
1991
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