Abstract
Although one has trusted that the tree-level string two-point amplitudes vanish due to the infinite volume of residual gauge symmetry, recently the non-zero string two-point amplitudes have been pointed out in the path integral formalism. We consider them in the operator formalism. We have succeeded in obtaining the non-zero two-point amplitude in an open bosonic string theory by introducing a novel mostly BRST exact operator. We then show some trials in a closed string theory.
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REFERENCES
H. Erbin, J. Maldacena, and D. Skliros, “Two-point string amplitudes,” J. High Energy Phys. 1907, 139 (2019); arXiv: 1906.06051 [hep-th].
S. Seki and T. Takahashi, “Two-point string amplitudes revisited by operator formalism,” Phys. Lett. B 800, 135078 (2020); arXiv: 1909.03672 [hep-th].
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Shigenori Seki String Two-Point Amplitude Revisited by Operator Formalism. Phys. Part. Nuclei Lett. 17, 663–665 (2020). https://doi.org/10.1134/S1547477120050313
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DOI: https://doi.org/10.1134/S1547477120050313