Gauge invariant 1PI effective superstring field theory: inclusion of the Ramond sector

  • Ashoke Sen
Open Access
Regular Article - Theoretical Physics


We construct off-shell amplitudes in heterotic and type II string theories in-volving arbitrary combination of Ramond and Neveu-Schwarz sector external states. We also construct the equations of motion of a gauge invariant 1PI effective field theory which reproduces these off-shell amplitudes. Using this construction we prove 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 amplitudes. We also use this formalism to examine the conditions under which space-time supersymmetry is unbroken in the quantum theory.


Superstrings and Heterotic Strings String Field Theory 


Open Access

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Copyright information

© The Author(s) 2015

Authors and Affiliations

  1. 1.Harish-Chandra Research InstituteAllahabadIndia

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