Abstract
The models with free vector fields are analyzed on the light-front hypersurface. The massive vector model—Proca model—can be quantized unambiguously within the novel LF procedure, though it leads to singular terms in \(x^{+}\) coordinate. Also the modified models, where the Lorentz condition and the LC gauge conditions are explicitly induced by the Lagrange multipliers, are discussed. Possible massless limits are studied for all cases and modes are classified as either physical or nonphysical. A practical definition of physical modes by properties of the 1-particle states is proposed.
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Dzimida-Chmielewska, E., Przeszowski, J.A. Physical and Nonphysical Modes in the Light Front Formulation for the LC Gauge and the Lorentz Gauge Conditions. Few-Body Syst 58, 120 (2017). https://doi.org/10.1007/s00601-017-1277-3
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DOI: https://doi.org/10.1007/s00601-017-1277-3