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.
Two-Point String Amplitudes
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A survey of tachyons and tadpoles in non-supersymmetric closed and orientifold strings, including ten-dimensional models and landscape attempts.
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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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Aspects of strings without spacetime supersymmetry
A survey of tachyons and tadpoles in non-supersymmetric closed and orientifold strings, including ten-dimensional models and landscape attempts.