Abstract
The following results are established for the open string: 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=2MPlanck at leveln=2.
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