A non-local boundary term constructed via BRST commutator with a step-function operator restores cyclicity in bosonic string field theory and yields correct tree-level two-point amplitudes for open and closed strings.
Reduction of open string amplitudes by mostly BRST ex- act operators
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A Non-local "Boundary'' Term for Two-Point Amplitudes in String Field Theory
A non-local boundary term constructed via BRST commutator with a step-function operator restores cyclicity in bosonic string field theory and yields correct tree-level two-point amplitudes for open and closed strings.