According to standard thermophysical theories, cross effects are mostly
present in multicomponent systems. In this paper we show that for relativistic
fluids an electric field generates a heat flux even in the single component
case. In the non-relativistic limit the effect vanishes and Fourier's law is
recovered. This result is novel and may have applications in the transport
properties of very hot plasmas.Comment: Paper submitted to the Journal of Non-Equilibrium Thermodynamic
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