``Good Propagation'' Constraints on Dual Invariant Actions in Electrodynamics and on Massless Fields

Abstract

We present some consequences of non-anomalous propagation requirements on various massless fields. Among the models of nonlinear electrodynamics we show that only Maxwell and Born-Infeld also obey duality invariance. Separately we show that, for actions depending only on the $F_\mn^2$ invariant, the permitted models have $L\sim \sqrt{1+F^2}$. We also characterize acceptable vector-scalar systems. Finally we find that wide classes of gravity models share with Einstein the null nature of their characteristic surfaces.

11 pages, LaTeX, no figures

References in corpus (1)

• Hamiltonian Electric/Magnetic Duality and Lorentz Invariance

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