A BRS invariant operator associated to the excitations of a string. Insertion of vertex operators
in the bulk (closed-string states) and on the boundary
(open-string states) allows to efficiently compute (super)string scattering amplitudes at each order in perturbation theory .
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Bibliography
M. B. Green, J. H. Schwarz and E. Witten, Superstring Theory, Cambridge University Press 1987.
V. Kac, Vertex algebras for beginners. Second edition. University Lecture Series, 10. American Mathematical Society, Providence, RI, 1998. vi+201 pp.
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Radford, C., Kawakita, M., Rivelles, V., Mazorchuk, V., Bianchi, M. (2004). Vertex Operator. In: Duplij, S., Siegel, W., Bagger, J. (eds) Concise Encyclopedia of Supersymmetry. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4522-0_678
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DOI: https://doi.org/10.1007/1-4020-4522-0_678
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