Abstract
We propose a transformation between the off-shell field variables of Witten’s open bosonic string field theory and the traditional lightcone string field theory of Kaku and Kikkawa, based on Mandelstam’s interacting string picture. This is accomplished by deforming the Witten vertex into lightcone cubic and quartic vertices, followed by integrating out the ghost and lightcone oscillator excitations from the string field. Surprisingly, the last step does not alter the cubic and quartic interactions and does not generate effective vertices, and leads precisely to Kaku and Kikkawa’s lightcone string field theory.
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Erler, T., Matsunaga, H. Mapping between Witten and lightcone string field theories. J. High Energ. Phys. 2021, 208 (2021). https://doi.org/10.1007/JHEP11(2021)208
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DOI: https://doi.org/10.1007/JHEP11(2021)208