Intrinsic normal-ordered vertex operators from the multiloop N-tachyon amplitude |
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| Institution: | 1. International Centre for Theoretical Physics, I-34100 Trieste, Italy;2. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34014 Trieste, Italy;3. International School for Advanced Studies (ISAS), I-34014 Trieste, Italy;4. Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina;1. Department of Physics and Biruni Observatory, Shiraz University, Shiraz 71454, Iran;2. Department of Theoretical Physics, Faculty of Science, University of Mazandaran, P. O. Box 47415-416, Babolsar, Iran;3. ICRANet-Mazandaran, University of Mazandaran, P. O. Box 47415-416, Babolsar, Iran;4. ICRANet, Piazza della Repubblica 10, I-65122 Pescara, Italy;1. Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland;2. IJCLab, Pôle Théorie (Bat. 210), CNRS/IN2P3 et Université, Paris-Saclay, 91405 Orsay, France;1. Department of Physics, National University of Defense Technology, 410073 Changsha, People''s Republic of China;2. College of Science, China Three Gorges University, 443002 Yichang, People''s Republic of China;1. Institut für Physik, Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany;2. Department of Physics, Middle East Technical University, 06800, Ankara, Turkey |
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| Abstract: | We construct vertex operators for arbitrary mass level states of the closed bosonic string. Starting from a generalization of the Koba-Nielsen amplitude which is suitable for an arbitrary genus Riemann surface, we read the vertex operators from the residues of the poles for the intermediate states. Since the original expression is metric independent and normal ordered without the need of inventing any regularization scheme, our vertex operators also possess these properties. We discuss their general features. |
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