Summary
We argue that Witten's covariant open-string field theory already implies its covariant closed-string field theory analog. The respective analog closedstring field theory is explicitly exhibited.
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Other efforts to construct closed string physics via Witten's formalism are those byJ. A. Shapiro: Rutgers preprint RU-87-46, 1987;A. Strominger:Phys. Rev. Lett.,58, 629 (1987); and,P. Mansfield: Oxford preprint 84/88, 1988, and references therein.
Recently, several authors (C. Wendt: SLAC-PUB-4447, 1987;A. R. Bogojevic et al.: Brown preprint, 1988) have questioned the completeness of Witten's superstring action and his attendant gauge trasformation law. The results in our analysis are unaffected by such questions.
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Work supported by the Department of Energy, contract DE-AS05-76R03956.
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Ward, B.F.L. Manifestly covariant, gauge-invariant interacting closed-string field theory. Nuov Cim A 106, 309–316 (1993). https://doi.org/10.1007/BF02771446
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DOI: https://doi.org/10.1007/BF02771446