Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-27
Mon.Not.Roy.Astron.Soc. 367 (2006) 1739-1745
Astronomy and Astrophysics
Astrophysics
7 pages, no figure. Section on Closure Relation revised. MNRAS accepted
Scientific paper
10.1111/j.1365-2966.2006.10081.x
Radiation interacts with matter via exchange of energy and momentum. When matter is moving with a relativistic velocity or when the background spacetime is strongly curved, rigorous relativistic treatment of hydrodynamics and radiative transfer is required. Here, we derive fully general relativistic radiation hydrodynamic equations from a covariant tensor formalism. The equations can be applied to any three-dimensional problems and are rather starightforward to understand compared to the comoving frame-based equations. Current approach is applicable to any spacetime or coordinates, but in this work we specifically choose the Schwarzschild spacetime to show explicitly how the hydrodynamic and the radiation moment equations are derived. Some important aspects of relativistic radiation hydrodynamics and the difficulty with the radiation moment formalism are discussed as well.
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