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Calculation of multiloop amplitudes in the theory of closed oriented superstrings

  • Elementary Particles and Fields Theory
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Abstract

Multiloop superstring amplitudes are obtained upon integrating local amplitudes with respect to modular parameters of the Schottky supergroup and with respect to vertex coordinates in the nonsplit (1|1) complex supermanifold. Ambiguities in this integration are removed by the condition requiring that the local symmetries of the amplitudes under discussion be conserved. Local superstring amplitudes are calculated by summing local fermion-string amplitudes. The resulting superstring amplitudes are free from divergencies. The vacuum amplitude is zero, in just the same way as the one-, two-, and three-point massless-boson amplitudes are. The amplitudes in question vanish after integration of corresponding local amplitudes with respect to interaction-vertex coordinates and with respect to the limiting points of the Schottky supergroup, with the exception of those (3|2) points that are fixed by SL(2) symmetry.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, 188300, Russia

    G. S. Danilov

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  1. G. S. Danilov
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Correspondence to G. S. Danilov.

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Original Russian Text © G.S. Danilov, 2017, published in Yadernaya Fizika, 2017, Vol. 80, No. 3, pp. 257–274.

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Danilov, G.S. Calculation of multiloop amplitudes in the theory of closed oriented superstrings. Phys. Atom. Nuclei 80, 473–490 (2017). https://doi.org/10.1134/S1063778817020120

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  • DOI: https://doi.org/10.1134/S1063778817020120

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