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.
Boundary terms in string field theory
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The BEF symplectic form is derived from L∞-Lagrangians via covariant phase space methods and coincides with the Barnich-Brandt form for second-order equations of motion.
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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.
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The BEF Symplectic Form: A Lagrangian Perspective
The BEF symplectic form is derived from L∞-Lagrangians via covariant phase space methods and coincides with the Barnich-Brandt form for second-order equations of motion.