Radiative Transfer Along Rays in Curved Spacetimes

Details Radiative Transfer Along Rays in Curved Spacetimes Radiative Transfer Along Rays in Curved Spacetimes

2005-11-17

arxiv.org/abs/astro-ph/0511515v1

Mon.Not.Roy.Astron.Soc.Lett.366:L10-L12,2006

Astronomy and Astrophysics

Astrophysics

To be published in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2005.00120.x

Radiative transfer in curved spacetimes has become increasingly important to understanding high-energy astrophysical phenomena and testing general relativity in the strong field limit. The equations of radiative transfer are physically equivalent to the Boltzmann equation, where the latter has the virtue of being covariant. We show that by a judicious choice of the basis of the phase space, it is generally possible to make the momentum derivatives in the Boltzmann equation vanish along an arbitrary (including nongeodesic) path, thus reducing the problem of radiative transfer along a ray to a path integral in coordinate space.

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