Abstract
We construct gauge invariant 1PI effective action for the NS sector of type II and heterotic string field theory. By construction, zero eigenvalues of the kinetic operator of this action determine the renormalized physical masses, and tree level amplitudes computed from this action (after gauge fixing) give the loop corrected S-matrix elements. Using this formalism we can give a simple proof of the result that the renormalized physical masses do not depend on the choice of local coordinate system and locations of picture changing operators used in defining the off-shell amplitude. We also eliminate the need for an infrared regulator in dealing with tadpoles of massless fields.
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Sen, A. Gauge invariant 1PI effective action for superstring field theory. J. High Energ. Phys. 2015, 22 (2015). https://doi.org/10.1007/JHEP06(2015)022
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DOI: https://doi.org/10.1007/JHEP06(2015)022