The kinetic theory of dilute gases to first order in the gradients yields
linear relations between forces and fluxes. The heat flux for the relativistic
gas has been shown to be related not only to the temperature gradient but also
to the density gradient in the representation where number density, temperature
and hydrodynamic velocity are the independent state variables. In this work we
show the calculation of the corresponding transport coefficients from the full
Boltzmann equation and compare the magnitude of the relativistic correction
The constitutive equations for the heat flux and the Navier tensor are established for a high temperature dilute gas in two spatial dimensions. The Chapman-Enskog procedure to first order in the gradients is applied in order to obtain the dissipative energy and momentum fluxes from the relativistic Boltzmann equation. The solution for such equation is written in terms of three sets of orthogonal polynomials which are explicitly obtained for this calculation. As in the three dimensional scenario, the heat flux is shown to be driven by the density, or pressure, gradient additionally to the usual temperature gradient given by Fourier's law. For the stress (Navier) tensor one finds, also in accordance with the three dimensional case, a non-vanishing bulk viscosity for the ideal monoatomic relativistic two-dimensional gas. All transport coefficients are calculated analytically for the case of a hard disk gas and the non-relativistic limit for the constitutive equations is verified.
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