Summary
Starting from the basic open-string Lagrangian system, we apply the methods of the operator field to the center-of-mass coordinateX 0. In this way, we arrive at a quantization of the open string for which the following results hold: 1) The ground state of the open string has energy 0 in the standard conventions of the method of the operator field. 2) There is no tachyon in the physical spectrum of the theory. 3) The lowest single-particle states correspond to a massless-vector state at leveln = 1 and a massive spin-2 particle of massM = 2M Planck at leveln = 2.
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References
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Work supported in part by the U.S. DOE, contract DE-AS05-75ER03956.
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Ward, B.F.L. Non-tachyonic ground state for string theory. Nuov Cim A 107, 521–531 (1994). https://doi.org/10.1007/BF02768786
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DOI: https://doi.org/10.1007/BF02768786