Abstract
The equations of radiation hydrodynamics are derived in the fluid frame description in arbitary geometry or symmetry, inclusive of terms of order ( v/ c). This is the natural frame for the collision terms and no expansion or approximation is necessary. The equations are valid in all regimes, diffusion as well as streaming. The various energy conservation equations are shown to reduce to the well known Eulerian radiation hydrodynamic equations, provided the distinction is made between the local proper fluid-frame time and the lab frame time.
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