Main Question or Discussion Point
In analog models of gravity, such as http://en.wikipedia.org/wiki/Acoustic_metric" [Broken], the motion of "matter" is influenced by the metric. Detection of Hawking radiation in sonic black holes is a goal that some experimental groups are working on. However, in GR geometry and matter act on each other. Are there analog models of gravity in which the metric is also shaped by "matter" via the Einstein field equation?
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