Geodesic
Generalized Symmetries of Massless Free Fields on Minkowski Space
Symmetry, integrability and geometry: methods and applications, Tome 4 (2008) Cet article a éte moissonné depuis la source Math-Net.Ru

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A complete and explicit classification of generalized, or local, symmetries of massless free fields of spin $s\geq1/2$ is carried out. Up to equivalence, these are found to consists of the conformal symmetries and their duals, new chiral symmetries of order $2s$, and their higher-order extensions obtained by Lie differentiation with respect to conformal Killing vectors. In particular, the results yield a complete classification of generalized symmetries of the Dirac–Weyl neutrino equation, Maxwell's equations, and the linearized gravity equations.
Keywords: generalized symmetries; massless free field; spinor field. 
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a3/}
}
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Juha Pohjanpelto; Stephen C. Anco. Generalized Symmetries of Massless Free Fields on Minkowski Space. Symmetry, integrability and geometry: methods and applications, Tome 4 (2008). http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a3/

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