Abstract
A concept of linear covariance is defined for nonlinear formal representations of the Poincaré group. Then it is proved that the formal nonlinear representations previously built for 2+1 dimensions with irreducible unitary massless representations as free parts (cf. (1)) are nonlinearly equivalent to linearly covariant representations.
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Rideau, G. Linear covariance for nonlinear formal representations of the Poincaré group in 2+1 dimensions. Lett Math Phys 20, 1–10 (1990). https://doi.org/10.1007/BF00417224
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DOI: https://doi.org/10.1007/BF00417224