Abstract
The dilaton is studied in the context of covariant, cubic, open and closed string field theories. The string field configuration corresponding to a dilaton plane wave in flat space is constructed. Taking the zero-momentum limit, it is shown that the string coupling constant is correctly rescaled by a shift in the dilaton expectation value. The demonstration involves a subtle interplay between world-sheet cohomology and the algebra of string fields. This shift can be viewed as the result of a singular gauge transformation.
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