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.
Gauge-invariant action for free string field theory with boundary
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Boundary observables analogous to Brown-York charges are constructed in free and interacting string field theory, with examples in open and closed SFT.
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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.