# Relativistic equation with arbitrary spin

can anyone give me some good references on how to obtain the relativistic equation of particles with arbitrary spin?

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What kind of equation? If the only demand is that it be Lorentz invariant then there are infinitely many possibilities (you can include as many derivatives as you want, etc.). To cut on possibilities one uses principles such as gauge invariance, etc. – Marek Aug 19 '11 at 9:25
Or in other words, the modern perspective is that one constructs Lagrangian and the equations are derived from that. The huge area of model building (of both SM and BSM physics, supersymmetry etc.) is precisely about constructing such Lagrangians using principles such as gauge invariance and also matching the observations. Without these principles, you can construct more or less anything (and most of it will be quite useless). – Marek Aug 19 '11 at 9:27
I was briefly looking into this some time ago and I remember names like "Fierz-Pauli equations" and "Fronsdal construction". – Heidar Aug 19 '11 at 9:58
Mybe arxiv.org/abs/hep-th/0409068 might be useful...? It contains a review of the results of Fierz, Pauli and Fronsdal. – Heidar Aug 19 '11 at 10:02