Abstract
The Gupta–Bleuler canonical quantization procedure for free massless gauge fields is applied to the Lagrangian potentials of arbitrary integer helicity. The supplementary conditions required to limit the particle states to the physical subspace of positive-definite metric and positive energy are explicitly set out using procedures that are uniform for all spins, bosonic and fermionic. The well-known lower-spin results (spins 1 and 2), where some of the arbitrary spin features are vacuous, arise as special cases.
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