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The physical state projection operator in dual resonance models for the critical dimension of space-time

Authors
Journal
Nuclear Physics B
0550-3213
Publisher
Elsevier
Publication Date
Volume
56
Issue
1
Identifiers
DOI: 10.1016/0550-3213(73)90231-9

Abstract

Abstract We present the physical state projection operator for the simple dual resonance model in twenty-six dimensions of space-time and unit intercept in two forms-(which are proved to be equivalent). One form obviously projects onto the so-called transverse states and the other obviously gives unity when inserted into any residue of a pole in a dual amplitude. Thus we explicitly verify the completeness of transverse states in 26 dimensions and have a weapon for constructing genuine unitary dual loop amplitudes (as shown in a second paper). We also present the corresponding results for the Neveu-Schwarz model.

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