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Originally Posted by JimJast
The "dynamical friction of photons" is a particular case of "dynamical friction" and it is particular only in this that it is related to photons. Everything else is the same as in ordinary "dynamical friction".
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A model of such a phenomenon might be an object moving through a stationary (e.g. virialized) cloud of dust not colliding with the dust particles of the cloud. The object by its passage though the cloud agitates somehow the cloud through gravitational interaction so the cloud particles gain kinetic energy. The total energy of the cloud and the object that moves through it remains constant and so the kinetic energy of the object becomes smaller. This reason for the loss of kinetic energy of the object due to its passage through a cloud of dust without touching the dust is called "dynamical friction".
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Jim I think that the object agitates the clouds by , not through gravity , but by fluid dynamics , swirls of matter drawn to the object as it passes through the cloud
what do you think ! I can picture it