Current exchanges and unconstrained higher spins |
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Authors: | D Francia J Mourad A Sagnotti |
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Institution: | 1. Department of Fundamental Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden;2. AstroParticule et Cosmologie (APC)1, Université Paris VII, Campus Paris Rive Gauche, 10, rue Alice Domon et Leonie Duquet, F-75205, Paris cedex 13, France;3. Scuola Normale Superiore and INFN, Piazza dei Cavalieri, 7, I-56126 Pisa, Italy |
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Abstract: | The (Fang–) Fronsdal formulation for free fully symmetric (spinor-) tensors rests on (γ -) trace constraints on gauge fields and parameters. When these are relaxed, glimpses of the underlying geometry emerge: the field equations extend to non-local expressions involving the higher-spin curvatures, and with only a pair of additional fields an equivalent “minimal” local formulation is also possible. In this paper we complete the discussion of the “minimal” formulation for fully symmetric (spinor-) tensors, constructing one-parameter families of Lagrangians and extending them to (A)dS backgrounds. We then turn on external currents, that in this setting are subject to conventional conservation laws and, by a close scrutiny of current exchanges in the various formulations, we clarify the precise link between the local and non-local versions of the theory. To this end, we first show the equivalence of the constrained and unconstrained local formulations, and then identify a unique set of non-local Lagrangian equations which behave in the same fashion in current exchanges. |
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