Higher Spins and Current Exchanges
arXiv:1002.3388
Abstract
The simplest higher-spin interactions involve classical external currents and symmetric tensors $ϕ_{\m_1 ... \m_s}$, and convey three instructive lessons. The first is a general form of the van Dam-Veltman-Zakharov discontinuity in flat space for this class of fields. The second is the rationale for its disappearance in (A)dS spaces. Finally, the third is a glimpse into an option which is commonly overlooked in Field Theory, and which both higher spins and String Theory are confronting us with: one can well allow in the Lagrangians non-local terms that do not spoil the local nature of physical quantities.
7 pages, LATEX. Lecture presented at the 9th Hellenic School on Elementary Particle Physics and Gravity, Corfu 2009
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