Free fields, which transform according to general irreducible representations of the
homogeneous Lorentz group, are constructed for any spin. The most general interactions …

The explicit Feynman rules are given for massive particles of any spin j, in both a 2 j+ 1-
component and a 2 (2 j+ 1)-component formalism. The propagators involve matrices which …

The most general free field which transforms locally under Lorentz transformations
according to a unitary representation of the homogeneous Lorentz group is constructed …

The Feynman rules are derived for massless particles of arbitrary spin j. The rules are the
same as those presented in an earlier article for m> 0, provided that we let m→ 0 in …

The problem of defining position and intrinsic spin operators in terms of the generators of the
inhomogeneous Lorentz group is considered. These operators are taken to have the …

Usually,, anti-symmetrical commutation relations a1e adopted for the different· kinds of.
spinor fields, In the case· of commutation relations of (+)-type between two different Fermi …

The unitary irreducible representations of the inhomogeneous, proper Lorentz group are
determined, using a prescription given by Wigner, with special emphasis on the case of zero …

The possibility of formulating covariant field equations for particles of arbitrary spin and
nonzero mass is considered. Using only the transformation properties of the single-particle …

The properties of the``local representations''of the rotation group corresponding to complex
angular momentum are further developed. Completeness and bi‐orthogonality relations are …

=—6~ vpyvvPP~ and the tensor (sL'~ v sE p vppppp 5p~ devised by Calogero However, if
now some interaction is envisaged, the above considerations must be further ap-plied to …